作者:Jacek Martynow、Martin Dimitroff、Alex G. Fallis
DOI:10.1016/s0040-4039(00)61390-4
日期:1993.12
The synthesis and cycloaddition of (+)-6-methoxy-1,3-benzoxathiolan-(Z)-2-carbomethoxypropenyl-3-oxide (1) with cyclopentadiene is described. This procedure allows the direct synthesis of useful enantiopure building blocks such as (+)-(1R,4R)-bicyclo[2.2.1]hept-5-en-2-one (2) and the precursor ketoester 11. Cycloaddition, at −78°C in the presence of BCl3, proceeded with complete π-facial preference
描述了(+)-6-甲氧基-1,3-苯并恶唑烷-(Z)-2-羰甲氧基丙烯基-3-氧化物(1)与环戊二烯的合成和环加成。该程序允许直接合成有用的对映纯构件,例如(+)-(1R,4R)-双环[2.2.1]庚-5-烯-2-酮(2)和酮酸酯11前体。在BCl 3存在下,于-78°C进行的环加成反应,与亲二烯体1的亚砜孤对完全π相偏。