Preparation of Silole Derivatives and Their Reactions with Dimethyl Acetylenedicarboxylate

Article abstract of DOI:10.1246/bcsj.66.2682

Reaction of silone derivatives such as 1,1,3,4-tetramethylsilole (1) and 2,3-dimethyl-5-silaspiro<4.4>nona-1,3-diene (2) with dimethyl acetylenedicarboxylate (DMADC) were investigated.It was found that the reactions of 1 and 2 with DMADC in toluene gave 7-membered ring componds; trimethyl 7-methoxy-3,3,3',4'-tetramethyl-6-oxa-3-sila-1,2-benzocyclohepta-1,4-diene-4,5,6'-tricarboxylate and trimethyl 5-methoxy-8,9-dimethylspiro<5H-4,1-benzoxasilepin-1,1'-silacyclopentane>-2,3,6-tricarboxylate, respectively.