Synthesis of Tetrahydropyran-4-ones and Thiopyran-4-ones from Donor-Substituted α-Bromostyrene Derivatives
作者:Anna Rosiak、Wolfgang Frey、Jens Christoffers
DOI:10.1002/ejoc.200600372
日期:2006.9
Tetrahydropyran-4-one and tetrahydrothiopyran-4-one derivatives with a 3-aryl substituent were synthesized by double-conjugate addition of water or H2S to divinyl ketones. These starting materials were prepared in two steps by conversion of lithiated α-bromostyrene derivatives with acrolein or cinnamaldehyde and subsequent oxidation of the divinyl alcohols with MnO2. The electron-rich α-bromostyrene
具有 3-芳基取代基的四氢吡喃-4-one 和四氢噻喃-4-one 衍生物通过水或 H2S 与二乙烯基酮的双共轭加成合成。通过用丙烯醛或肉桂醛转化锂化的 α-溴苯乙烯衍生物,然后用 MnO2 氧化二乙烯醇,分两步制备这些原料。富含电子的 α-溴苯乙烯构件是通过在严格无水条件下将 HBr 添加到相应的炔烃中来制备的,这在数克规模上可靠地工作。已经探索了两种具有特定取代模式的芳基乙炔路线;然而,在更大的范围内,只有 Corey-Fuchs 序列被证明是可行的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)