作者:Zhenzhuang Cheng、Yasumasa Hamada、Takayuki Shioiri
DOI:10.1055/s-1997-17829
日期:——
Two key intermediates used for the synthesis of hennoxazole A have been synthesized. The anti-β-protected hydroxyl epoxide 5 was prepared from (R)-(+)-malic acid by the stereoselective alkylation utilizing a chiral borane reagent as a key step. Construction of the dithiane substituted oxazole 6 was achieved by the coupling of L-(+)-lactic acid and L-serine methyl ester hydrochloride with diethyl phosphorocyanidate, followed by the construction of the oxazole ring.
用于合成hennoxazole A的两个关键中间体已被合成。抗β-保护的羟基环氧化物5是通过立体选择性的烷基化反应,利用手性硼烷试剂作为关键步骤从(R)-(+)-苹果酸制备而来。二硫杂环己烷 substituted 噁唑6是通过L-(+)-乳酸和L-丝氨酸甲酯盐酸盐与二乙基膦酰氰酸酯的耦合反应制备的,随后构建了噁唑环。