The THP ether of 4,5-dihydro-3-nitro-4-isoxazolol, prepared by a sequential nitroaldol nitrosative cyclization strategy, was converted to a 4,5-dihydro-3-(dithiolanyl)isoxazole; subsequent LBH reduction gave a 95:5 diastereomeric mixture of 2-deoxy-2-aminothreose and -erythrose derivatives, respectively, which was cyclized to a mixture of tetrahydro-2H-1,3-oxazine-2-ones.
通过连续的硝基
缩醛亚硝化环化策略制备的4,5-二氢-
3-硝基-4-
异恶唑的THP醚被转化为4,5-二氢-3-(二
硫代戊酰基)
异恶唑。随后的LBH还原分别得到2-脱氧-2-
氨基苏糖和-赤藓糖衍
生物的95:5非对映异构体混合物,将其环化为四氢-2 H -1,3-恶嗪-2-酮的混合物。