It has been established that a cationic rhodium(I)/H8–BINAP complex catalyzes the asymmetric [2 + 2 + 2] cycloaddition of 1,6-enynes with cyclopropylideneacetamides to produce spirocyclohexenes in excellent enantioselectivity with retaining cyclopropane rings.
现已确定,阳离子铑(I)/ H 8 -BINAP配合物可催化1,6-炔烃与环亚丙基乙酰胺的不对称[2 + 2 + 2]环加成反应,生成具有优异对映选择性并保留环丙烷环的螺环己烯。
Synthesis of α-Substituted Cyclobutane β-Keto Esters
作者:Ina Kortmann、Bernhard Westermann
DOI:10.1055/s-1995-4037
日期:1995.8
The title compounds, α-substituted β-keto esters 4, were prepared from suitably substituted cyclopropylideneacetates 2 by epoxidation and Wagner-Meerwein rearrangement. The highly strained oxaspiro[2.2]pentane intermediate 3 was isolated.
Synthesis of Spirocyclic Pyrrolidines: Advanced Building Blocks for Drug Discovery
作者:Bohdan A. Chalyk、Maryna V. Butko、Oksana O. Yanshyna、Konstantin S. Gavrilenko、Tetiana V. Druzhenko、Pavel K. Mykhailiuk
DOI:10.1002/chem.201702362
日期:2017.11.27
In the context of drug discovery, novel spirocyclic pyrrolidines have been synthesized in two steps from common three‐ to seven‐membered‐ring (hetero)alicyclicketones. The key transformation is a reaction between an electron‐deficient exocyclic alkene and an in situ generated N‐benzyl azomethine ylide. The developed method has been used to synthesize the central diamine core of the known antibacterial
Catalytic asymmetric construction of spiro pyrrolidines with contiguous quaternary centers via 1,3-dipolar cycloaddition of azomethine ylides
作者:Tanglin Liu、Qinghua Li、Zhaolin He、Jiawei Zhang、Chunjiang Wang
DOI:10.1016/s1872-2067(14)60204-7
日期:2015.1
high functionality and up to three contiguous all-carbon quaternary stereogenic centers were synthesized by Cu(I)-catalyzed asymmetric endo-selective 1,3-dipolarcycloaddition of azomethineylides with cyclopropylidene acetates. This synthesis system performs well for a broad scope of substrates. α-unsubstituted/α-substituted azomethineylides and cyclopropylidene acetates are compatible 1,3-dipoles
Facile and Effective Copper-Mediated Cyclization Reaction of Cyclopropylideneacetic Acids (or Esters) and Cyclopropylideneacetonitriles
作者:Xian Huang、Hongwei Zhou、Wanli Chen
DOI:10.1021/jo035225h
日期:2004.2.1
The full details of the copper-mediated cyclization reaction of cyclopropylideneacetic acids (or esters) and cyclopropylidenenitriles, the synthetic application of this reaction, and the study of the reaction mechanism are reported.