Camphor-derived 2-stannyl-N-Boc-1,3-oxazolidine: A new chiral formylanion equivalent for the asymmetric synthesis of 1,2-diols
作者:Lino Colombo、Marcello Di Giacomo、Gloria Brusotti、Ettore Milano
DOI:10.1016/0040-4039(95)00369-n
日期:1995.4
3-oxazolidine 6, prepared from the camphor-derived aminoalcohol 5, was converted to diastereomerically pure 2-acyl derivatives 8 in three steps. Reaction of these ketones with Grignard reagents at −78°C proceeded with high stereoselectivity affording tertiary carbinols which gave 1,2-diols with >96% ee after hydrolysis and reduction of the intermediate α-hydroxy aldehydes. A new deblocking procedure of the
由樟脑衍生的氨基醇5制备的光学纯的2-三丁基锡烷基-N-Boc-1,3-恶唑烷6经三步转化为非对映体纯的2-酰基衍生物8。这些酮与格氏试剂在-78℃下的反应以高的立体选择性进行,得到叔甲醇,其在水解和还原中间的α-羟基醛后,得到具有> 96%ee的1,2-二醇。还描述了t-Boc组的新解块过程。