The organic synthesis using haloboration reaction 20. A simple synthesis of (2-Bromoallyl)diphenoxyborane by the bromoboration of allene and its reaction with carbonyl compounds
作者:Shoji Hara、Akira Suzuki
DOI:10.1016/s0040-4039(00)93593-7
日期:1991.11
Bromoboration reaction of allene with boron tribromide, followed by the treatment with anisole gives (2-bromoally)diphenoxyborane which reacts with aldehydes and ketones to give 2-bromohomoallylic alcohols in excellent yields.
Approaches to bicyclic ring systems via 1,5 allylic abstraction cyclisation
作者:A.D. Borthwick、S. Caddick、P.J. Parsons
DOI:10.1016/s0040-4020(01)88361-7
日期:1992.11
A new 1, 5 allylic abstraction, cyclisation sequence has been developed and applied to the synthesis of fused bicyclic systems. Initial studies directed towards the synthesis of the bicyclo[3.3.0] octane skeleton are described. vinyl bromide 4 was subjected to standard cyclisation conditions to give 5 as a single isomer. Further studies were directly related to the development of the rearrangement sequence: vinyl bromide 10 was subject to cyclisation conditions to give 12 in moderate yield. A significant improvement in the rate and efficiency of this type of conversion was achieved by introducing an electron withdrawing group on the acceptor alkene, thus compound 17 gives 18 in excellent yield.
BORTHWICK, ALAN D.;CADDICK, STEPHEN;PARSONS, PHILIP J., TETRAHEDRON LETT, 31,(1990) N7, C. 6910-6914
作者:BORTHWICK, ALAN D.、CADDICK, STEPHEN、PARSONS, PHILIP J.
DOI:——
日期:——
1,5 Allylic abstraction, cyclisation: A new route to five membered carbocycles
作者:Alan D Borthwick、Stephen Caddick、Philip J Parsons
DOI:10.1016/s0040-4039(00)97205-8
日期:1990.1
A new 1,5 allylic abstraction cyclisationsequence has been developed. The method is based upon a novel radical rearrangement and is applicable to the construction of highly functionalised cyclopentanoid ring systems.