作者:Jack E. Baldwin、Robert M. Adlington、Mark B. Mitchell、Jeremy Robertson
DOI:10.1016/s0040-4020(01)86541-8
日期:1991.7
The synthesis of 10–15 membered α-methylene macrocyclic lactones from the functionalised allylstannanes (7e)–(7j) is described. Attempts to synthesise analogous 6–9 membered lactones proved unsuccessful, resulting instead in the production of dilactones and AIBN derived adducts.
Diels-Alder reaction of α-substituted acrylates and α-(methylene)lactones: Conformation of dienophiles and endo/exo selectivity
作者:Kei Takeda、Ikuhiro Imaoka、Eiichi Yoshii
DOI:10.1016/s0040-4020(01)85696-9
日期:1994.1
Diels-Alderreaction of 1,6-bis(trimethylsilyloxy)-2,4-hexadiene with α-substituted acrylates and 5 to 7- and 9 to 11-membered α-(methylene)lactones has been carried out to examine correlation of dienophile structure with endo/exo selectivity. While the conformationally flexible acrylates produced cycloadducts of endo/exo = 59:41 to 74:26, the 5 to 7-membered lactones with rigid s-cis conjugate system