Stereoselective access to functionalized β-γ unsaturated acids
摘要:
Stereoselective synthesis of vinylstannanes bearing a carboxylic acid function was achieved from beta-gamma alkynoic acids via hydrostannation, stannylcupration or silastannation reactions. Regioselectivity is highly dependent on the nature of the stannylanions used and on protection of the carboxylic acid function. (C) 2003 Elsevier Science Ltd. All rights reserved.
Transannular Diels-Alder approach to the synthesis of momilactone A
摘要:
The application of the transannular Diels-Alder strategy on macrocyclic trienes having the trans-trans-cis olefin geometry led to trans-syn-trans tricycles which are advanced intermediates for the synthesis of natural products like Momilactone A. (C) 1999 Elsevier Science Ltd. All rights reserved.
The stereoselective synthesis of vinylstannanes bearing car☐ylic acid function was achieved from acetylenic acids via stannylcupration reaction. In homoallylic series, regioselectivities are highly dependant on the nature of stannylanionids and on the protection of the car☐ylic acid function.
The first total synthesis of (+/-)-momilactone A was accomplished using a highly diastereoselective transannular Diels-Alder reaction on a trans-trans-cis macrocyclic triene.