Construction of a quaternary carbon at the carbonyl carbon of the cyclohexane ring
作者:Yuki Kaneko、Yohei Kiyotsuka、Hukum P. Acharya、Yuichi Kobayashi
DOI:10.1039/c0cc00653j
日期:——
High S(N)2' selectivity in the allylicsubstitution of cyclohexylidene ethyl picolinates with copper reagents prepared from RMgBr and CuBr.Me(2)S was realized by addition of ZnX(2) (X = I, Br, Cl). Furthermore, ZnX(2) accelerated the reaction with the bulky iPr reagent.
A Novel and Highly Stereoselective Approach to Aza-Spirocycles. A Short Total Synthesis of 2-<i>epi</i>-(±)-Perhydrohistrionicotoxin and an Unprecedented Decarboxylation of 2-Pyrones
作者:Michael J. McLaughlin、Richard P. Hsung、Kevin P. Cole、Juliet M. Hahn、Jiashi Wang
DOI:10.1021/ol020052o
日期:2002.6.1
[reaction: see text] A novel and highly stereoselectivesynthesis of aza-spirocycles is described. An application of this methodology is illustrated as a short and concise totalsynthesis of 2-epi-(+/-)-perhydrohistrionicotoxin with high diastereomeric control at the aza-spirocenter. An unprecedented decarboxylation of the 2-pyrone ring is observed in this totalsynthesis effort.
A Rh(III)-Catalyzed Formal [4+1] Approach to Pyrrolidines from Unactivated Terminal Alkenes and Nitrene Sources
作者:Sumin Lee、Honghui Lei、Tomislav Rovis
DOI:10.1021/jacs.9b07012
日期:2019.8.14
formal [4+1] approach to pyrrolidines from readily available unactivated terminalalkenes as 4-carbon partners. The reaction provides a rapid construction of various pyrrolidine containing structures, especially for the diastereoselective synthesis of spiro-pyrrolidines. Mechanistic investigation suggests a Rh(III)-catalyzed intermolecular aziridination of the alkene and subsequent acid-promoted ring expansion