M. Yoshimatsu et al., THE FIRST EXAMPLE OF THE 1-CHALCOGENE-SUBSTITUTED FORMYLOLEFINATION OF THE KETONES AND ALDEHYDES USING 1-LITHIO-2-ETHOXYVINYL CHALCOGENIDES, Journal of organic chemistry, 63(13), 1998, pp. 4475-4480
The alpha-chalcogene-substituted formylolefinations of ketones and ald
ehydes proceeded using 1-lithio-2-ethoxyvinyl chalcogenides/PPSE or TM
SOTf produce the alpha-chalcogenoformylolefinated products 4a-1 in hig
h yields. Tandem-formylolefination provided the (2Z,4Z)-2,4-bis(chalco
geno)pent-2,4-dienals 5d,h,i and (2Z,4Z,6Z)-2,4,6-tris(phenylthio)hept
-2, derivatives 7d and 8d, respectively.