Synthesis of Carbocycles via Intramolecular Conjugate Additions: Another Solution to the Terpenoid Side Chain Stereochemistry Problem
摘要:
Intramolecular conjugate additions of keto esters 7-11, mediated by pyrrolidine-acetic acid, provide perhydroindans or bicyclo[6.3.0]undecanes with high levels of diastereoselectivity at the acyclic stereogenic center. Levels of acyclic diastereoselection depend on starting unsaturated ester olefin geometry.
Palladium-catalyzed reaction of α-bromo ketones with hexabutylditin in the presence of trimethylsilylchloride gave enoltrimethylsilylether in moderate to good yields.
Cyclopentenones by internal acylation of vinylsilanes. Rapid construction of trichothecane-type carbon frameworks
作者:Eiichi Nakamura、Kentaro Fukuzaki、Isao Kuwajima
DOI:10.1039/c39830000499
日期:——
The internalacylation of vinylsilanes has made available new syntheses of cyclopentenones and efficient routes to the intermediates for trichothecane synthesis.
乙烯基硅烷的内部酰化已为环戊烯酮提供了新的合成方法,并为三氯噻吩合成的中间体提供了有效的途径。
Highly regioselective carbonylation of vinylsilanes: a remarkable effect of organosilicon substituent
作者:Ryo Takeuchi、Naomi Ishii、Nobuhiro Sato
DOI:10.1039/c39910001247
日期:——
The Pd-catalysed hydroesterification of vinylsilanes affords β-silyl esters 1 in high yields with high selectivity, whereas α-silyl esters 2 are obtained in high yields with high selectivity by the Co catalyst.
Pd 催化乙烯基硅烷的氢酯化反应以高产率和高选择性得到 β-甲硅烷基酯 1,而通过 Co 催化剂以高产率和高选择性获得 α-甲硅烷基酯 2。
Initiator for group transfer polymerization
申请人:E. I. Du Pont de Nemours and Company
公开号:US05021524A1
公开(公告)日:1991-06-04
This invention relates to a polymerization process initiated by selected organo-silicon, -germanium and -tin compounds, and to "living" polymers therefrom.
本发明涉及由选择性的有机硅、锗和锡化合物引发的聚合过程,以及所得的“活性”聚合物。
Anti‐Selective Carbosilylation: Nickel‐Catalyzed Multicomponent Reaction of Solid Me<sub>3</sub>SiZnI
vinylsilanes via the anti-selective addition of a novel solid Me3SiZnI to terminal alkynes. An equilibrium exists between the intermediate syn- and anti-adducts, where the anti-selectivity is determined by the larger barrier at the single electron reduction of alkyl halides and the thermodynamic stability of the Ni(III) adduct.
这项研究提出了一种独特的方法,通过将新型固体 Me 3 SiZnI 反选择性加成到末端炔烃上,选择性合成立体定义的三取代乙烯基硅烷。中间顺式加合物和反式加合物之间存在平衡,其中反选择性由烷基卤化物单电子还原时的较大势垒和 Ni(III) 加合物的热力学稳定性决定。