(4SR,6SR)-4-methyl-6-(prop-2'-yl)tetrahydropyran-2-one | 57058-20-5

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 内酯类
• 英文名称: (4SR,6SR)-4-methyl-6-(prop-2'-yl)tetrahydropyran-2-one
• 英文别名: cis-4-Methyl-6-(1-methylethyl)-3,4,5,6-tetrahydro-2H-pyran-2-on
• CAS: 57058-20-5；97309-52-9
• 化学式: C₉H₁₆O₂
• 分子量: 156.225
• InChiKey: IBHWVDODTVKFMT-YUMQZZPRSA-N

物化性质

• 沸点：
  232.4±8.0 °C(Predicted)
• 密度：
  0.940±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.98
• 重原子数：
  11.0
• 可旋转键数：
  1.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.89
• 拓扑面积：
  26.3
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为产物：
  描述：

  4-Methyl-6-(1-methylethyl)-3,6-dihydro-2H-pyran-2-on 在 Pd-BaSO₄ 氢气 作用下， 以 乙酸乙酯 为溶剂， 反应 24.0h， 以98%的产率得到(4SR,6SR)-4-methyl-6-(prop-2'-yl)tetrahydropyran-2-one
  参考文献：
  名称：

  Bardili, Burkhart; Marschall-Weyerstahl, Helga; Weyerstahl, Peter, Liebigs Annalen der Chemie, 1985, # 2, p. 275 - 300

  摘要：

  DOI：

文献信息

• 1,3-Asymmetric Induction in Stereoselective Rhodium-Catalyzed Hydroformylation of Homomethallylic Alcohols⋆
  作者：Bernhard Breit

  DOI：10.1002/(sici)1099-0690(199806)1998:6<1123::aid-ejoc1123>3.0.co;2-y

  日期：1998.6

  catalyst directing group (CDG) allows an efficient substrate-directed diastereoselective hydroformylation of acyclic homomethallylic alcohols 5, making use of 1,3-asymmetric induction. The corresponding anti-aldehydes 10 were obtained as the major diastereomer in all cases, with diastereomer ratios of ca. 91:9 (anti:syn). Supporting evidence could be obtained for the ability of the o-DPPB group to act as a

  引入邻二苯基膦酰基苯甲酰基作为底物结合的催化剂导向基团 (CDG)，可以利用 1,3-不对称诱导对非环状均甲烯丙醇 5 进行有效的底物导向非对映选择性加氢甲酰化。相应的反醛 10 在所有情况下都作为主要的非对映异构体获得，非对映异构体的比例约为。91:9（反：syn）。可以获得 o-DPPB 基团通过可逆催化剂配位作为催化剂导向基团 (CDG) 的能力的支持证据。最后，设计了一个模型，使 1,3-不对称归纳的起源合理化。该模型基于构象分析（核磁共振研究，MACROMODEL/MM3 计算），并表明优选的底物构象与实验确定的立体选择性之间的关系。与该模型一致的是，抗高甲烯丙醇衍生物 15 (21) 加氢甲酰化后立体选择性的预测显着改善。
• Stereochemistry of the reaction of Si–phenyl silenes with butadienes: elaboration of the silacycloadducts to provide a novel route to substituted lactones
  作者：Mahesh J. Sanganee、Patrick G. Steel、Daniel K. Whelligan

  DOI：10.1039/b404175e

  日期：——

  silacycles accompanied by variable amounts of competing ene, [2 + 2] and silene dimer by-products. The silacycles are formed with good chemo- and stereo-selectivity and provide access to diols and lactones via a phenyl-triggered Fleming-Tamao oxidation.

  可以通过[4 + 2]环加成途径，通过一系列烷基丁二烯截留通过甲硅烷基修饰的Peterson烯烃化程序生成的硅，从而提供硅杂环化合物，并伴以不同量的竞争性烯，[2 + 2]和硅二聚体副产物。形成的silacycles具有良好的化学和立体选择性，并通过苯基触发的Fleming-Tamao氧化提供了与二醇和内酯的通道。
• In search of open-chain 1,3-stereocontrol
  作者：Asun Barbero、David C. Blakemore、Ian Fleming、Robert N. Wesley

  DOI：10.1039/a607545b

  日期：——

  Methylation of methyl 4-phenylpentanoate 25 gives the diastereoisomers methyl (2RS,4SR )-2-methyl-4-phenylpentanoate 26 and methyl (2RS,4RS)- 2-methyl-4-phenylpentanoate 27 in a ratio of 44∶56. The aldehydes 3-dimethyl(phenyl)silylbutanal 28, 3-dimethyl(phenyl)silyl-3-phenylpropanal 32 and 3-dimethyl(phenyl)silyl-4-methylpentanal 36, each of which has a stereogenic centre on C-3 carrying a silyl group and successively also a methyl, a phenyl and an isopropyl group, react with a range of methyl, phenyl and isopropyl nucleophiles to give pairs of diastereoisomeric secondary alcohols 40–42, 47–49 and 54–56 having 1,3 related stereocentres. The same alcohols 43–45, 50–52 and 57–59 are also prepared by reduction of the corresponding ketones 29–31, 33–35 and 37–39 with a range of hydride reagents, and three of the ketones, 31, 35 and 39, react with phenyllithium to give mixtures of the tertiary alcohols 46, 53 and 60. The (E)- and (Z)-α,β-unsaturated methyl esters, 61, 62, 64, 65, 67 and 68, prepared from the same three aldehydes with methoxycarbonylmethyltriphenylphosphorane, react with the phenyldimethylsilyl-cuprate and -zincate reagents to give diastereoisomeric pairs of 1,3-disilylated esters. Likewise, the α,β-unsaturated dimethyl diesters, 63, 66 and 69, prepared from the same three aldehydes with dimethyl malonate, react with phenyldimethylsilyllithium and the corresponding cuprate and zincate reagents to give diastereoisomeric pairs of 1,3-disilylated diesters, and with various methyl and phenyl nucleophiles to give the corresponding pairs of diastereoisomeric diesters with stereogenic centres at C-3 and C-5. The relative stereochemistry of all but two of the products having 1,3-related stereocentres has been proved by silyl-to-hydroxy conversion using mercuric acetate and peracetic acid to give the corresponding alcohols or their derived lactones.An attempt to identify a purely steric rule by which it might be possible to predict which diastereoisomer would be the major product in each of these reactions was based on arguments about, and molecular mechanics calculations of, the lowest-energy conformations of the starting materials. The only rule that emerges is that ketones are regularly attacked in sense B, defined in the drawings 21 and 23, in a conformation that minimises the interaction between the group M on the stereogenic centre and the group R1 on the other side of the ketone, but even within this group of reactions, phenyl groups in either or both locations sometimes lead to anomalies.Krapcho reactions take place more rapidly and in higher yield using four equivalents of lithium chloride in place of the usual sodium chloride, and adding two equivalents of water to the DMSO.

  将 4-苯基戊酸甲酯 25 甲酯化，得到非对映异构体(2RS,4SR )-2-甲基-4-苯基戊酸甲酯 26 和(2RS,4RS)-2-甲基-4-苯基戊酸甲酯 27，比例为 44∶56。3-二甲基（苯基）硅基丁醛 28、3-二甲基（苯基）硅基-3-苯基丙醛 32 和 3-二甲基（苯基）硅基-4-甲基戊醛 36，每种醛的 C-3 上都有一个带有硅基的立体中心，并先后带有一个甲基、一个苯基和一个异丙基、与一系列的甲基、苯基和异丙基亲核物反应，得到一对非对映异构的仲醇 40-42、47-49 和 54-56，它们具有 1,3 个相关的立体中心。同样的醇 43-45、50-52 和 57-59 也可以通过相应的酮 29-31、33-35 和 37-39 与一系列氢化物试剂发生还原反应来制备，其中三个酮 31、35 和 39 与苯基锂发生反应，得到叔醇 46、53 和 60 的混合物。 (E)-和(Z)-α,β-不饱和甲基酯 61、62、64、65、67 和 68 由相同的三种醛与甲氧羰基甲基三苯基膦制备而成，它们与苯基二甲基硅琥珀酸酯试剂和锌酸试剂反应，得到非对映异构的 1,3-二硅烷化酯对。同样，由相同的三种醛与丙二酸二甲酯制备的 α、β-不饱和二甲基二酯 63、66 和 69 与苯基二甲基硅烷基锂及相应的铜酸盐和锌酸盐试剂发生反应，生成一对非对映异构的 1,3-二硅烷基二酯，与各种甲基和苯基亲核剂发生反应，生成相应的一对非对映异构的二酯，其立体中心位于 C-3 和 C-5。除了两种具有 1,3 相关立体中心的产物外，其他所有产物的相对立体化学性质都已通过使用乙酸巯基和过乙酸进行硅基-羟基转换而得到相应的醇或其衍生内酯得到证实。出现的唯一规则是，酮在图 21 和图 23 中定义的 B 意义上经常被攻击，其构象使立体中心上的基团 M 与酮另一侧的基团 R1 之间的相互作用最小，但即使在这组反应中，苯基在任一位置或两个位置有时也会导致异常。
• Silenes as novel synthetic reagents: synthesis of diols and lactones from simple alkyldienes
  作者：Malcolm B. Berry、Russell J. Griffiths、Mahesh J. Sanganee、Patrick G. Steel、Daniel K. Whelligan

  DOI：10.1016/j.tetlet.2003.10.056

  日期：2003.12

  Aryl substituted silenes can be generated by a modified Peterson olefination reaction and trapped in situ to afford silacycles with high diastereoselectivity. These silacycles can be elaborated by 'Fleming-Tamao' type oxidation to provide access to functionalized diols and lactones. (C) 2003 Elsevier Ltd. All rights reserved.