申请人:Hoffmann-La Roche Inc.
公开号:US04661641A1
公开(公告)日:1987-04-28
Compounds of the formula ##STR1## wherein n is either 0 or 1; R.sup.1 and R.sup.2 is hydrogen and the other is hydrogen, hydroxy, oxo group, a protected hydroxy or protected oxo group; R.sup.3 is hydroxy oxo group, .dbd.CH--CH.sub.2 --OH, .dbd.CH--CHO or one of the foregoing groups where the hydroxy or oxo functions are protected; R.sup.4 is --CO--OR.sup.6, --CO--R.sup.6, --CO--NR.sup.6 R.sup.7, --CO--Cl or --SO.sub.2 --R.sup.6 ; R.sup.6 is saturated or aromatic hydrocarbon; and R.sup.7 is saturated or aromatic hydrocarbon or hydrogen, are converted by cleavage of R.sup.4 OH into corresponding cycloalkenes and protecting groups, if present, are hydrolyzed. The compounds obtained are valuable intermediates in carotenoid syntheses.
化合物的公式为##STR1##其中n为0或1;R.sup.1和R.sup.2是氢,另一个是氢,羟基,氧羰基,受保护的羟基或受保护的氧羰基;R.sup.3是羟基氧羰基,.dbd.CH--CH.sub.2 --OH,.dbd.CH--CHO或上述其中一个群,其中羟基或氧羰功能被保护;R.sup.4是--CO--OR.sup.6,--CO--R.sup.6,--CO--NR.sup.6 R.sup.7,--CO--Cl或--SO.sub.2 --R.sup.6;R.sup.6是饱和或芳香烃;R.sup.7是饱和或芳香烃或氢,通过裂解R.sup.4 OH转化为相应的环烯烃,并且如有保护基,将其水解。获得的化合物是类胡萝卜素合成中有价值的中间体。