A synthetic entry into fused pyran derivatives through carbon transfer reactions of 1,3-oxazinanes and oxazolidines with carbon nucleophiles
作者:Kamaljit Singh、Jasbir Singh、Harjit Singh
DOI:10.1016/0040-4020(96)00879-4
日期:1996.11
of various 2 substituted 1,3-oxazinanes 3 and 1,3-oxazolidines 4 with cyclic carbonnucleophiles viz. 5,5-dimethyl-1,3-cyclohexanedione and 1,3-cyclohexanedione furnish xanthene derivatives, whereas a Knoevenagel reaction proceeds with acyclic nucleophiles. In case of 4b and 4c, a unique synthesis of functionalised α-tetralones has emerged. Reactions of mixtures of cyclic and acyclic carbon nucleophiles