作者:Colin B. Reese、Hongbin Yan
DOI:10.1039/b102923c
日期:——
The preparation of racemic, (S)- and (R)-1,2-O-(xanthen-9-ylidene)glycerol 17a, 20a and 23a and racemic, (S)- and (R)-1,2-O-(2,7-dimethylxanthen-9-ylidene)glycerol 17b, 20b and 23b is reported. The racemic derivatives 17a and 17b are converted into their stearate esters, which are then treated with dichloroacetic acid and pyrrole under mild conditions to give racemic 1-O-stearoylglycerol 25 in good yield. The xanthen-9-ylidene and 2,7-dimethylxanthen-9-ylidene residues are incorporated into 9,9-di(pyrrol-2-yl)xanthene 36 and 2,7-dimethyl-9,9-di(pyrrol-2-yl)xanthene 37. These by-products are easily removed by treatment with iron(III) chloride in diethyl ether solution. What are believed to be enantiomerically pure (R)- and (S)-1-O-stearoylglycerol 28 and 5 are similarly prepared in good yields from (S)- and (R)-1,2-O-(xanthen-9-ylidene)glycerol 20a and 23a.
报道了外消旋、(S)-和(R)-1,2-O-(氧杂蒽-9-亚基)甘油17a、20a和23a以及外消旋、(S)-和(R)-1,2-O-(2,7-二甲基氧杂蒽-9-亚基)甘油17b、20b和23b的制备。外消旋衍生物17a和17b被转化为它们的硬脂酸酯,然后在温和条件下与二氯乙酸和吡咯反应,以良好产率得到外消旋的1-O-硬脂酰甘油25。氧杂蒽-9-亚基和2,7-二甲基氧杂蒽-9-亚基残基被并入到9,9-双(吡咯-2-基)氧杂蒽36和2,7-二甲基-9,9-双(吡咯-2-基)氧杂蒽37中。这些副产物通过在乙醚溶液中用三氯化铁处理很容易被去除。据信,从(S)-和(R)-1,2-O-(氧杂蒽-9-亚基)甘油20a和23a中以良好产率同样制备了光学纯的(R)-和(S)-1-O-硬脂酰甘油28和5。