The diastereoselectivity in the alkylations of N-substituted 2-oxo-2-propyl-1,3,2-oxazaphosphorinanes 3a-c is influenced by the bulkiness of the nitrogen substituent. The α-carbanion derivatives of oxazaphosphorinanes 3b,c are unstable in the presence of DMPU and afford unexpected products.
N-取代的2-氧代-2-丙基-1,3,2-氧氮杂膦烷3a-c的烷基化中的非对映选择性受到氮取代基体积的影响。氧氮杂膦烷 3b,c 的 α-碳负离子衍
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DMPU 存在下不稳定并产生意想不到的产物。