Synthesis based on cyclohexadienes: Part 10 synthesis of 5,5-dimethyl-7-methoxy-4-oxatricyclo[4.3.1.0]decan-2-ones.
摘要:
Synthesis of 5, 5-dimethyl- 7-methoxy-4 -oxatricyclo[4,3,1,0(3,7)]- decan-2-one 3a, a novel heterocyclic ring system present in morellin 1, and its 3-substituted derivatives 3b-e, is described from the Diels-Alder adducts 7, available from 1-methoxycyclohexa-1,4-dienes 4. Two routes, which involved the halocyclisation and the oxidative addition, were investigated for the conversion of the adducts 7 into 3. While the halocyclisation method resulted in mixtures, excellent yields of the target molecule were obtained by the second method. Solvolysis of the bromoether 9 resulted in a mixture of rearranged products 10, 13, 15 and 16.
isomerization and Diels-Alderreaction of 2,5-dihydroanisoles are presented. Some of the further chemistry of the products is detailed. The in situ generation, and further reactions of 2,3-dihydroanisoles by the pyrolysis of 2-methoxy-1,4-dihydrobenzoic acids is described. This technique constitutes a route to certain cyclohexadienes otherwise difficult of access. The in situ isomerization and Diels-Alder reaction
ACAT inhibitors derived from hetero-Diels-Alder cycloadducts of thioaldehydes
作者:Richard G. Wilde、Jeffrey T. Billheimer、Sandie J. Germain、Elizabeth A. Hausner、Paul C. Meunier、Deborah A. Munzer、Janet K. Stoltenborg、Peter J. Gillies、Deborah L. Burcham、Shiew-Mai Huang、John D. Klaczkiewicz、Soo S. Ko、Ruth R. Wexler
DOI:10.1016/0968-0896(96)00143-5
日期:1996.9
Acyl-CoA:cholesterol acyltransferase (ACAT) is the enzyme largely responsible for intracellular cholesterol esterification. A systemic inhibitor of ACAT is believed to be able to slow or even reverse the atherosclerotic process. Towards that goal, a series of cyclic sulfides, derived from the hetero-Diels-Alder reaction of thioaldehydes with 1,3-dienes, and bearing carboxamide substituents, were prepared and evaluated for in vitro (in several tissues and species) and ex vivo ACAT inhibition. Minor changes in subsequent structure were found to have a significant effect in optimization of the biological activity of this series of compounds. Copyright (C) 1996 The DuPont Merck Pharmaceutical Company.
Raghavan, Sadagopan; Rao, G. S. R. Subba, Heterocycles, 1994, vol. 37, # 1, p. 131 - 136
作者:Raghavan, Sadagopan、Rao, G. S. R. Subba
DOI:——
日期:——
Synthesis and absolute configuration of (R)- and (S)-ethyl 3-(4-oxocyclohex-2-enyl)propionate