295(1), c = 20.547(3) A, and β = 102.66(1)°. The structure was solved by direct methods and refined by a full-matrix, least-squares procedure against 3839 unique reflections (F > 2σ F ), resulting in a final R = 0.045 (unit weights). The configuration at the new chiral center (C-1) was established as S ( d ). The galactopyranose rings have conformations 4 C 1 (tri- O -benzylated moiety) and ° S 5 + °
摘要6-O-苄基-7,8-二脱氧-1,2:3,4-二-O-异亚丙基-d-
甘油-α-d-半
乳糖基-oct-7-
吡喃
葡萄糖与2,3,3-甲基苯甲基的缩合4-三-O-苄基-6-脱氧-β-d-半
乳糖-
庚二醛-1,5-
吡喃糖苷提供3- [6( R)-O-苄基-1,2:3,4-二-O-异亚丙基-α-d-
吡喃半
乳糖-6-基] -1-羟基-1-(甲基2,3,4-三-O-苄基-6-脱氧-β-d-
吡喃半
乳糖苷-6-基)
丙炔。通过X射线衍射法在四圆衍射仪中研究了1a的1-O-乙酰基衍
生物(1c)的单晶。化合物1c在单斜晶系系统中结晶,空间群P2 1(Z = 2),晶胞尺寸为a = 14.896(2),b = 8.295(1),c = 20.547(3)A和β= 102.66(1)° 。通过直接方法对结构进行了解析,并通过全矩阵对其进行了细化,最小二乘程序针对3839个唯一反射(F>2σF),最终的R = 0.0