Syntheses of Both Diastereoisomers of 2,8-Dioxabicyclo[3.2.1]octane Derivatives: Degradation Products of Daphniphyllum Alkaloids
作者:Boonsong Kongkathip、Rongsan Sookkho、Ngampong Kongkathip、Walter C. Taylor
DOI:10.1246/cl.1999.1095
日期:1999.10
Both diastereoisomers of 1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octane-4-caboxylic acid ester (3, 4) and the 4-hydroxy methyl analogues (5, 6) were synthesised from ethyl acetoacetate and diethyl malonate respectively. The key step of these process involved intramolecular cyclisation using palladium chloride as catalyst.
1,4-二甲基-2,8-二氧杂双环[3.2.1]辛烷-4-羧酸酯的非对映异构体 (3, 4) 和 4-羟甲基类似物 (5, 6) 均由乙酰乙酸乙酯和二乙酯合成分别为丙二酸。这些过程的关键步骤涉及使用氯化钯作为催化剂的分子内环化。