Chromium(0)-Promoted [6π + 2π] Cycloadditions of Allenes with Cycloheptatriene
作者:James H. Rigby、Stéphane B. Laurent、Zeeshan Kamal、Mary Jane Heeg
DOI:10.1021/ol802401a
日期:2008.12.18
Photoinitiated [6pi + 2pi] cycloadditions of allenes with (eta(6)-cycloheptatriene)tricarbonylchromium(0) (1) are described. An example of asymmetric induction obtained by reaction of 1 with a chiral 1,3-disubstituted allene is also reported.
The hydroboration of terminal allenes with pinacolborane was carried out at 50 °C in the presence of a Pt(dba)2/2PR3 catalyst. The formation of one of three possible monohydroboration products was regioselectively synthesized by choosing an appropriate phosphine ligand.
A new method for the synthesis of opticallyactive α-hydroxyalkynylsilane 3 is described. The key step of the conversion to 3 was the use of the reverse Brook rearrangement of the 2-alkynyl silyl ether 2.
Synthesis of α-substituted α,β-unsaturated acylsilanes
作者:Marcus A Tius、Huaping Hu
DOI:10.1016/s0040-4039(98)01219-2
日期:1998.8
alpha-Deprotonation of tert-butyldimethylsilyloxy allene is followed by silyl migration from oxygen to carbon. The resulting C-nucleophile adds to aldehydes to generate alpha,beta-unsaturated acylsilanes.(C) 1998 Elsevier Science Ltd. All rights reserved.
α,β-Unsaturated Acyl Silanes
作者:Ioanna A. Stergiades、Marcus A. Tius
DOI:10.1021/jo990894+
日期:1999.10.1
A rapid method for the synthesis of alpha,beta-unsaturated acyl silanes from allenyl trialkylsilyl ethers and aldehydes or ketones has been developed. The method is general and leads to the acyl silane products in good to excellent yields.