(4S)-4-isopropyl-2-methyl-4,5-dihydro-1,3-oxazole | 88362-46-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑啉类
• 英文名称: (4S)-4-isopropyl-2-methyl-4,5-dihydro-1,3-oxazole
• 英文别名: 4-(S)-isopropyl-2-methyloxazoline；(4S)-2-methyl-4-propan-2-yl-4,5-dihydro-1,3-oxazole
• CAS: 88362-46-3
• 化学式: C₇H₁₃NO
• 分子量: 127.186
• InChiKey: FOPMZVNMDQVZKG-SSDOTTSWSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.2
• 重原子数：
  9
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  21.6
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (4S)-4-isopropyl-2-methyl-4,5-dihydro-1,3-oxazole 在 吡啶 、 selenium(IV) oxide 作用下， 以 吡啶 为溶剂， 反应 1.0h， 以11%的产率得到(S)-4-异丙基-2-唑烷酮
  参考文献：
  名称：

  Oxidative Rearrangement of 2-Substituted Oxazolines. A Novel Entry to 5,6-Dihydro-2H-1,4-oxazin-2-ones and Morpholin-2-ones

  摘要：

  A novel synthesis of 5,6-dihydro-2H-1,4-oxazin-2-ones by SeO2-promoted oxidative rearrangement of 2-alkyl- and 2-(arylmethyl)oxazolines is described. Yields are good to excellent; (up to 94%) with the highest yields obtained for 2-arylmethyl- and 2-neopentyl-substituted oxazolines. This reaction provides convenient access to novel 5-aryl-substituted dihydrooxazinones in high yield. The latter compounds are important ''chiral glycine'' synthons for asymmetric synthesis of a-amino acids. Since oxazolines are readily derived from carboxylic acids or their equivalents, this oxidative rearrangement constitutes an entry to synthesis of a-amino acids from carboxylic acids. A mechanism is proposed to account for the rearrangement involving a ''nitrilium to acylium'' 1,2-migration.

  DOI：

  10.1021/jo952144f
• 作为产物：
  描述：

  L-valinol 生成 (4S)-4-isopropyl-2-methyl-4,5-dihydro-1,3-oxazole
  参考文献：
  名称：

  New synthesis of β-amino acids by nucleophilic addition of enolate anions to N-methoxycarbonylimines generated from α-methoxy carbamates1

  摘要：

  DOI：

  10.1016/s0040-4039(00)80062-3

文献信息

• Highly diastereoselective synthesis of arylglycine derivatives via TFA-promoted Friedel–Crafts reactions of phenols with cyclic glyoxylate imines
  作者：Yong-Jun Chen、Fei Lei、Li Liu、Dong Wang

  DOI：10.1016/s0040-4020(03)01142-6

  日期：2003.9

  Optically active α-arylglycine derivatives were synthesized by Brønsted acid (TFA)-promoted Friedel–Crafts reaction of various phenols with chiral cyclic glyoxylate imines (2a–c), followed by deprotection with Pd(OH)2/C under H2. The diastereoselectivities of the initially formed F–C reaction products are up to 99%.

  通过布朗斯台德酸（TFA）促进的各种酚与手性环状乙醛酸亚胺（2a – c）的Friedel-Crafts反应，然后在H 2下用Pd（OH）2 / C脱保护，可以合成光学活性的α-芳基甘氨酸衍生物。最初形成的F–C反应产物的非对映选择性高达99％。
• Asymmetric Iodonio-[3,3]-Sigmatropic Rearrangement to Access Chiral α-Aryl Carbonyl Compounds
  作者：Junsong Tian、Fan Luo、Qifeng Zhang、Yuchen Liang、Dongyang Li、Yaling Zhan、Lichun Kong、Zhi-Xiang Wang、Bo Peng

  DOI：10.1021/jacs.0c00783

  日期：2020.4.15

  Here we describe an asymmetric [3,3]-sigmatropic rearrangement of aryl iodanes that enables the enantioselective α-arylation of chiral 2-oxazolines, thereby producing valuable, chiral α-aryl carbonyl compounds. The success of this protocol hinges on the selective assembly of aryl iodanes with 2-oxazolines and the smooth deprotonation of the in situ generated iodonium-imine species. The nearly neutral

  在这里，我们描述了芳基碘的不对称 [3,3]-sigmatropic 重排，使手性 2-恶唑啉的对映选择性 α-芳基化成为可能，从而产生有价值的手性 α-芳基羰基化合物。该协议的成功取决于芳基碘与 2-恶唑啉的选择性组装以及原位生成的碘亚胺物种的顺利去质子化。反应的近中性和温和条件使其能够耐受多种官能团。此外，产品中剩余的碘原子不仅为进一步加工此类分子提供了通用平台，而且还为不对称高价碘化学提供了一类新的手性支架。
• Palladium-Catalyzed Amide-Directed Enantioselective Hydrocarbofunctionalization of Unactivated Alkenes Using a Chiral Monodentate Oxazoline Ligand
  作者：Hao Wang、Zibo Bai、Tangqian Jiao、Zhiqiang Deng、Huarong Tong、Gang He、Qian Peng、Gong Chen

  DOI：10.1021/jacs.8b00641

  日期：2018.3.14

  developed using a chiral monodentate oxazoline (MOXin) ligand. Various indoles react at C3 position with aminoquinoline-coupled 3-alkenamides to give γ addition products in good to excellent yield and enantioselectivity. This study represents an important advance of the development of chiral monodentate oxazoline ligands, which have been underexplored for asymmetric catalysis.

  使用手性单齿恶唑啉 (MOXin) 配体开发了 Pd 催化的酰胺导向的对映选择性烃功能化未活化烯烃与 CH 亲核试剂。各种吲哚在 C3 位与氨基喹啉偶联的 3-链烯酰胺反应，以良好的收率和对映选择性得到 γ 加成产物。这项研究代表了手性单齿恶唑啉配体开发的重要进展，该配体在不对称催化方面的探索尚未充分。
• Stereoselective radical cyclizations of N-(2-halobenzoyl)-cyclic ketene-N,X(X=O, S)-acetals
  作者：Aihua Zhou、Moses N. Njogu、Charles U. Pittman

  DOI：10.1016/j.tet.2006.02.018

  日期：2006.4

  2-Alkyloxazolines and 2-alkylthiazolines react with 2-halobenzoyl chlorides to form N-(2-halobenzoyl)-cyclic ketene-N,O-acetals and N-(2-halobenzoyl)-cyclic ketene-N,S-acetals in excellent yields, respectively. These ketene acetals readily undergo stereocontrolled aryl radical cyclizations to afford the central six-membered rings of substituted-2,3,10,10α-tetrahydrooxazolo[3,2-b]isoquinolin-5-ones

  2-烷基恶唑啉和2-烷基噻唑啉与2-卤代苯甲酰氯反应生成N-（2-卤代苯甲酰基）-环烯酮-N，O-缩醛和N-（2-卤代苯甲酰基）-环烯酮-N，S-缩醛产量分别。这些乙烯酮缩醛易于进行立体控制的芳基自由基环化，以提供取代的2,3,10,10α-四氢恶唑并[3,2 - b ]异喹啉-5-酮及其2,3,10,10α的中心六元环-四氢噻唑并[3，2 - b ]异喹啉-5-酮类似物。第三级N，O-和N，S-在烯酮-N，X（X ＝ O，S）-乙缩醛双键上发生的由芳基自由基反应形成的基团似乎具有合理的稳定性。研究了这些中间自由基从Bu 3 SnH和（Me 3 Si）3 SiH提取氢的立体选择性。的Ñ，š -杂环稠环的产品可能具有潜在的医疗价值。
• Lewis Acid-Catalyzed Asymmetric Diels–Alder Reactions Using Chiral Sulfoxide Ligands: Chiral 2-(Arylsulfinylmethyl)-1,3-oxazoline Derivatives
  作者：Kazuhiro Watanabe、Takashi Hirasawa、Kunio Hiroi

  DOI：10.1248/cpb.50.372

  日期：——

  New chiral sulfoxide-1,3-oxazoline ligands have been developed as chiral ligands for Lewis acid-catalyzed asymmetric Diels-Alder reactions. The use of chiral sulfinyl 1,3-oxazoline ligands in copper(II)-catalyzed asymmetric Diels-Alder reactions provided an endo cycloadduct as a major product with moderate enantioselectivity. A rationale is proposed for the mechanism of the asymmetric induction.

  已开发出新的手性亚砜-1,3-恶唑啉配体作为路易斯酸催化的不对称Diels-Alder反应的手性配体。在铜（II）催化的不对称Diels-Alder反应中使用手性亚磺酰基1,3-恶唑啉配体可提供内环加合物作为主要产物，具有中等对映选择性。提出了不对称感应机理的基本原理。