Conformational Study of Some Saturated 2-[Bis(2-chloroethyl)amino]-1,3,2-benzoxazaphosphorinane 2-Oxides
作者:Tapio Viljanen、Petri Tähtinen、Kalevi Pihlaja、Ferenc Fülöp
DOI:10.1021/jo971490p
日期:1998.2.1
trans-fused 2-[bis(2-chloroethyl)amino]-3,4,4a,5,6,7,8,8a-octahydro-1,3,2-benzoxazaphosphorinane 2-oxides and their 3-methyl and 3-benzyl derivatives were performed by (1)H, (13)C, (31)P, and variable-temperature NMR methods. Depending on the P-2 configuration and the substituent on N-3, different equilibria between chair-chair and chair-twist-boat conformations were found for the trans-fused isomers. The N-3
顺式和反式融合的2- [双(2-氯乙基)氨基] -3,4,4a,5,6,7,8,8a-八氢-1,3,2-苯并氮杂膦氧烷2-氧化物的构象分析它们的3-甲基和3-苄基衍生物是通过(1)H,(13)C,(31)P和可变温度NMR方法进行的。取决于P-2构型和N-3上的取代基,发现转椅异构体在椅子-椅子和椅子-扭曲-船构象之间的不同平衡。N-3取代基使平衡向椅柄方向移动,幅度为甲基>苄基>氢。在顺式异构体中,N-3取代基的性质会影响同一序列中O-in和O-out构象之间的平衡。