We have successfully developed the asymmetric hydrogenation of β‐silyl‐α,β‐unsaturatedesters to prepare chiral 3‐substituted‐3‐silylpropionic esterproducts catalyzed by rhodium/bisphosphine‐thiourea (ZhaoPhos) with excellent results (up to 97% yield, >99% ee, 1500 TON). Moreover, our hydrogenation products can be efficiently converted to other important organic molecules, such as chiral ethyl (R
Tertiary α‐Silyl Alcohols by Diastereoselective Coupling of 1,3‐Dienes and Acylsilanes Initiated by Enantioselective Copper‐Catalyzed Borylation
作者:Jian‐Jun Feng、Martin Oestreich
DOI:10.1002/anie.201903174
日期:2019.6.11
enantio‐ and diastereoselective copper‐catalyzed three‐component coupling of 1,3‐dienes, bis(pinacolato)diboron, and acylsilanes is reported. The reaction proceeds well with different 1,3‐dienes and a broad range of aryl‐ as well as alkenyl‐ but also alkyl‐substituted acylsilanes. The target compounds are formed with high regio‐, diastereo‐, and enantioselectivity (up to 99 % ee and d.r. >20:1) and are
Pyrolysis of methylsilyl phenyl ketones. Formation of silene in the decomposition of an intermediate silaoxetane
作者:Wataru Ando、Akira Sekiguchi
DOI:10.1016/s0022-328x(00)92877-8
日期:1977.6
intramolecular insertion into the CH bond of a silyl-methyl group to give an unstable silaoxetane intermediate. The thermal decomposition of the silaoxetane proceeded by cleavage of both the silicon-carbon and the silicon-oxygen bonds. The scission of the SiC bond gave styrene and an SiO doublebonded intermediate which trimerized to a cyclotrisiloxane. On the other hand, the scission of the SiO bond yielded