(2S,3R)-1,2-epoxy-2-methylpentan-3-ol | 159170-70-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (2S,3R)-1,2-epoxy-2-methylpentan-3-ol
• 英文别名: (1R)-1-[(2S)-2-methyloxiran-2-yl]propan-1-ol
• CAS: 159170-70-4
• 化学式: C₆H₁₂O₂
• 分子量: 116.16
• InChiKey: JOULHMRAPSKNHJ-RITPCOANSA-N

物化性质

• 沸点：
  166.8±8.0 °C(predicted)
• 密度：
  1.034±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.4
• 重原子数：
  8
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  32.8
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (2S,3R)-1,2-epoxy-2-methylpentan-3-ol 在 titanium(IV) isopropylate 、 4-甲基苯磺酸吡啶 、 三甲基乙酸 作用下， 生成 ((4S,5R)-5-ethyl-2,2,4-trimethyl-1,3-dioxolan-4-yl)methanol
  参考文献：
  名称：

  Total Synthesis of (−)-4,8,10-Tridesmethyl Telithromycin

  摘要：

  Novel sources of antibiotics are required to address the serious problem of antibiotic resistance. Telithromycin (2) is a third-generation macrolide antibiotic prepared from erythromycin (1) and used clinically since 2004. Herein we report the details of our efforts that ultimately led to the total synthesis of (-)-4,8,10-tridesmethyl telithromycin (3) wherein methyl groups have been replaced with hydrogens. The synthesis of desmethyl macrolides has emerged as a novel strategy for preparing bioactive antibiotics.

  DOI：

  10.1021/jo201319b
• 作为产物：
  描述：

  2-甲基-1-戊烯-3-醇 在 titanium(IV) isopropylate 、 叔丁基过氧化氢 、 4 A molecular sieve 、 D-(-)-酒石酸二异丙酯 作用下， 生成 (2S,3R)-1,2-epoxy-2-methylpentan-3-ol
  参考文献：
  名称：

  Strategies for Macrolide Synthesis. A Concise Approach to Protected Seco-Acids of Erythronolides A and B

  摘要：

  Concise syntheses of protected derivatives of the seco-acids of erythronolides A and B, 5 and 6, respectively, have been completed wherein the longest linear sequence requires only 13 chemical steps from 5-ethylfuraldehyde (15). The syntheses commenced with the asymmetric aldol condensation of 15 according to the Evans protocol to afford the optically pure syn adduct 16, thereby establishing the critical stereocenters at C(4) and C(5) of the erythromycin backbone. Reductive removal of the chiral auxiliary from 16 gave the diol 17, which was converted to the bicyclic enone 18 by an one-pot process involving sequential oxidation of the furan ring and acid-catalyzed bicycloketalization. Stereoselective elaboration of 18 to the tertiary alcohol 19 was achieved in two steps by sequential treatment with lithium dimethylcuprate and methyllithium in the presence of cerium trichloride. Compound 19 underwent facile acid-catalyzed reorganization to the isomeric ketal 21, which was transformed into 24 by a Swern oxidation and a second asymmetric aldol condensation. However, the necessary refunctionalization of 24 into a ketone that would participate in the requisite aldol reaction to append the C(11)-C(15) segment of the erythronolide backbone could not be induced. On the other hand, transthioketalization of 19 gave the triol 26, which was converted to 28 by the thermodynamically-controlled formation of an acetonide of the 1,2-diol array. Deprotection of the C(9) ketone function followed by Swern oxidation produced the keto aldehyde 31, which underwent chemoselective, Lewis acid-mediated addition of tri-n-butylcrotylstannane to the aldehyde function to furnish a mixture (4:1) of the homoallylic alcohols 32 and 33; the major product 32 comprises the C(1)-C(10) subunit common to the seco-acids of both erythronolides A and B. Diastereoselective aldol condensation of the enolate derived from 32 with 40 gave 42 as the major adduct; oxidative processing of the terminal olefin then delivered the erythronolide B seco-acid derivative 46. The proposed structure of 42 was initially based upon its conversion into the polyol 48, which was identical to that derived from natural erythronolide B (49). Subsequent to this chemical correlation, the X-ray structure of 50, which was prepared from 42, unequivocally verified this assignment. In experiments directed toward the preparation of the seco-acid of erythronolide A, the directed aldol reactions of 32 with the aldehydes 59 and 60 were examined. Although the addition of the enolate of 32 to 59 produced none of the requisite adduct, its reaction with 60 gave a mixture (1:5) of 62 and 64. Stereoselective reduction of the C(9) carbonyl function of 62 followed by oxidative cleavage of the double bond and global deprotection gave the polyol 62, which was identical with the polyol derived from natural erythromycin A (1).

  DOI：

  10.1021/ja00090a016

文献信息

• A convenient, highly stereoselective synthesis of anti-α,β-epoxy alcohols by the Luche reduction of α,β-epoxy ketones
  作者：Keqiang Li、Lawrence G. Hamann、Masato Koreeda

  DOI：10.1016/s0040-4039(00)60987-5

  日期：1992.10

  Reduction of α,β-epoxy ketones under the Luche conditions with NaBH4/CeCl3 in MeOH provides anti- (or erythro-) α,β-epoxy alcohols in high yields and with extremely high stereoselectivity.

  在Luche条件下，用MeOH中的NaBH 4 / CeCl 3还原α，β-环氧酮可提供高收率和极高的立体选择性的抗（或赤型）α，β-环氧醇。
• Strategies for Macrolide Synthesis. A Concise Approach to Protected Seco-Acids of Erythronolides A and B
  作者：Stephen F. Martin、Wen-Cherng Lee、Gregory J. Pacofsky、Ricky P. Gist、Thomas A. Mulhern

  DOI：10.1021/ja00090a016

  日期：1994.6

  Concise syntheses of protected derivatives of the seco-acids of erythronolides A and B, 5 and 6, respectively, have been completed wherein the longest linear sequence requires only 13 chemical steps from 5-ethylfuraldehyde (15). The syntheses commenced with the asymmetric aldol condensation of 15 according to the Evans protocol to afford the optically pure syn adduct 16, thereby establishing the critical stereocenters at C(4) and C(5) of the erythromycin backbone. Reductive removal of the chiral auxiliary from 16 gave the diol 17, which was converted to the bicyclic enone 18 by an one-pot process involving sequential oxidation of the furan ring and acid-catalyzed bicycloketalization. Stereoselective elaboration of 18 to the tertiary alcohol 19 was achieved in two steps by sequential treatment with lithium dimethylcuprate and methyllithium in the presence of cerium trichloride. Compound 19 underwent facile acid-catalyzed reorganization to the isomeric ketal 21, which was transformed into 24 by a Swern oxidation and a second asymmetric aldol condensation. However, the necessary refunctionalization of 24 into a ketone that would participate in the requisite aldol reaction to append the C(11)-C(15) segment of the erythronolide backbone could not be induced. On the other hand, transthioketalization of 19 gave the triol 26, which was converted to 28 by the thermodynamically-controlled formation of an acetonide of the 1,2-diol array. Deprotection of the C(9) ketone function followed by Swern oxidation produced the keto aldehyde 31, which underwent chemoselective, Lewis acid-mediated addition of tri-n-butylcrotylstannane to the aldehyde function to furnish a mixture (4:1) of the homoallylic alcohols 32 and 33; the major product 32 comprises the C(1)-C(10) subunit common to the seco-acids of both erythronolides A and B. Diastereoselective aldol condensation of the enolate derived from 32 with 40 gave 42 as the major adduct; oxidative processing of the terminal olefin then delivered the erythronolide B seco-acid derivative 46. The proposed structure of 42 was initially based upon its conversion into the polyol 48, which was identical to that derived from natural erythronolide B (49). Subsequent to this chemical correlation, the X-ray structure of 50, which was prepared from 42, unequivocally verified this assignment. In experiments directed toward the preparation of the seco-acid of erythronolide A, the directed aldol reactions of 32 with the aldehydes 59 and 60 were examined. Although the addition of the enolate of 32 to 59 produced none of the requisite adduct, its reaction with 60 gave a mixture (1:5) of 62 and 64. Stereoselective reduction of the C(9) carbonyl function of 62 followed by oxidative cleavage of the double bond and global deprotection gave the polyol 62, which was identical with the polyol derived from natural erythromycin A (1).
• Desmethyl Macrolides: Synthesis and Evaluation of 4,8,10-Tridesmethyl Telithromycin
  作者：Venkata Velvadapu、Tapas Paul、Bharat Wagh、Dorota Klepacki、Olgun Guvench、Alexander MacKerell、Rodrigo B. Andrade

  DOI：10.1021/ml1002184

  日期：2011.1.13

  There is an urgent need to discover new drugs to address the pressing problem of antibiotic resistance. Macrolide antibiotics such as erythromycin (1) are safe, broad spectrum antibiotics used in the clinic since 1954. Herein, we report the synthesis and evaluation of 4,8,10-tridesmethyl telithromycin (3), a novel desmethyl analogue of the third-generation drug telithromycin (2), which is a semisynthetic derivative of 1. Analogue 3 was found to possess antibiotic activity and was superior to telithromycin (2) when tested against resistant strains of Staphylococcus aureus possessing an A -> T mutation at position 2058 (Escherichia coli numbering).
• Total Synthesis of (−)-4,8,10-Tridesmethyl Telithromycin
  作者：Venkata Velvadapu、Tapas Paul、Bharat Wagh、Ian Glassford、Charles DeBrosse、Rodrigo B. Andrade

  DOI：10.1021/jo201319b

  日期：2011.9.16

  Novel sources of antibiotics are required to address the serious problem of antibiotic resistance. Telithromycin (2) is a third-generation macrolide antibiotic prepared from erythromycin (1) and used clinically since 2004. Herein we report the details of our efforts that ultimately led to the total synthesis of (-)-4,8,10-tridesmethyl telithromycin (3) wherein methyl groups have been replaced with hydrogens. The synthesis of desmethyl macrolides has emerged as a novel strategy for preparing bioactive antibiotics.