The Simmons-Smith reaction starting fromallylic alcohols using (R,R)-diethyl tartrate as a chiral auxiliary was found to proceed enantioselectively; i.e., the treatment of allylicallylic alcohols with diethylzinc and diethyl tartrate, followed by the reaction with diethylzinc and diiodomethane, afforded the corresponding cyclopropylmethyl alcohols in optically active form
Stereoselective Carbocyclization of Vinyloxiranes Catalyzed by Lewis Acids: Construction of the Musellarin Tricyclic Core
作者:Sehui Yang、Euijin Park、Jimin Kim
DOI:10.1002/bkcs.12236
日期:2021.4
Stereoselective carbocyclizations of vinyloxiranes were efficiently catalyzed by Lewis acids to provide cyclic homoallyl alcohols as single isomers. The choice of Lewis acid, B(C6F5)3 was crucial for the stereoselective transformation in the case of cis vinyloxiranes, whereas BF3∙OEt2 was proven to be an effective catalyst for trans substrates. The method was well implemented in the synthesis of seven‐membered
乙烯基氧杂环丁烷的立体选择性碳环化被路易斯酸有效地催化,以提供环状均烯丙基醇作为单一异构体。在顺式乙烯基环氧乙烷的情况下,路易斯酸B(C 6 F 5)3的选择对于立体选择性转化至关重要,而事实证明BF 3 ∙OEt 2是反式底物的有效催化剂。该方法在具有官能团耐受性的七元环和六元环的合成中得到了很好的实现。所得的效用反式-和顺高烯丙基醇被证明简明地建立musellarin A和E的三环核心
Complete Retention of <i>Z</i> Geometry in Allylic Substitution Catalyzed by an Iridium Complex
作者:Ryo Takeuchi、Norihito Shiga
DOI:10.1021/ol990033n
日期:1999.7.1
[GRAPHICS]The Z geometry of methyl (Z)-3-monosubstituted-2-alkenyl carbonate was completely retained in iridium complex-catalyzed allylic amination. The reaction of methyl (Z)-2-nonenyl carbonate with piperidine in the presence of a catalytic amount of [Ir(COD)Cl](2) and P(OPh)(3) at 50 degrees C for 2 h gave a 98:2 mixture of (Z)-1-(2-nonenyl)piperidine and 1-(1-n-hexyl-2-propenyl)piperidine in 86% yield, No E isomer was obtained. Various (Z) allylic amines were obtained in 91-100% selectivity by allylic amination of methyl (Z) 3-monosubstituted-2-alkenyl carbonate.
A novel reaction of allylic alcohols with hexafluoropropene-diethylamine adduct (PPDA) to form 2-fluoro-2-trifluoromethyl-4-alkenamide
作者:Ken-ichi Ogu、Motohiro Akazome、Katsuyuki Ogura
DOI:10.1016/s0022-1139(03)00191-x
日期:2003.11
Treatment of allylic alcohols with hexafluoropropene-diethylamine adduct (PPDA) afforded N,N-diethyl-2-fluoro-2-trifluoromethyl-4-alkenamides which were formed by the Claisen rearrangement of intermediary 2-alkenyl-1-diethylamino-2,3,3,3-tetrafluoro-1-propenyl ethers. Although (E)-allylic alcohols gave two diastereomeric products in about 1:1 ratio, (Z)-allylic alcohols gave the corresponding product as a single diastereomer. (C) 2003 Elsevier B.V. All rights reserved.
Palladium-catalyzed cross-coupling of aryl halides and olefinic epoxides via palladium migration
作者:Richard C. Larock、Wai Yee Leung
DOI:10.1021/jo00313a006
日期:1990.12
The palladium-catalyzed cross-coupling of aryl halides and olefinic epoxides bearing one to ten carbons between the two functional groups affords good yields of arylated allylic alcohols by a palladium migration process.