The Diels–Alder route to allylsilanes from 1-trimethylsilylbutadienes
作者:Martin J. Carter、Ian Fleming、Alan Percival
DOI:10.1039/p19810002415
日期:——
which undergo clean protodesilylation with acid, and, with the acid and ester derived from the maleic anhydride adduct of (3), undergo epoxidation and sulphenylation reactions giving an allyl alcohol (33) and an allyl sulphide (37), respectively. The adducts from (20) can be hydrolysed to β-silylketones, which can be converted into enones by bromination. 1-Pentamethyldisilylbutadiene (15) is no more
Internally Lewis acid-catalyzed Diels-Alder cycloadditions
作者:Hugues Bienaymé、Alexia Longeau
DOI:10.1016/s0040-4020(97)00636-4
日期:1997.7
Suitable dienes, covalently connected to a Lewis acid, such a 1-dimethylaluminum dienolates, undergo very rapid and selective Diets-Alder cycloadditions with various dienophiles. For these processes, a cooperativity between enthalpic (dienophile activation) and entropic (reactants pre-association) factors is thought to be responsible for the high reactivities and regio/stereo-selectivities observed. (C) 1997 Elsevier Science Ltd.