Can the conformational flexibility of cis-decalins be modulated through intramolecular O–H⋯O hydrogen bonding? Profiling the molecular and supramolecular attributes of designer cis-fused polycyclitols
作者:Goverdhan Mehta、Saikat Sen、T.H. Suresha Kumara
DOI:10.1016/j.tet.2011.03.042
日期:2011.5
In order to unravel the modalities of hydrogen bonding in conformationally flexible polycyclitols vis-à-vis their conformationally locked siblings, three diastereomeric perhydro-2,3,4a,6,7,8a-naphthalenehexols, all embodying a 4a,8a-dihydroxy-cis-decalin framework, have been synthesized via sequential stereo-controlled oxyfunctionalization of 1,4,5,8-tetrahydronaphthalene. Variable temperature NMR
为了解开在构象柔性polycyclitols氢键的方式可见- à -可见其构象锁定的兄弟姐妹,三非对映体全氢2,3,4a,6,7,8a-naphthalenehexols,所有体现一4A,8A二羟基顺式-十氢萘骨架,是通过顺序立体控制的1,4,5,8-四氢萘的氧官能化合成的。顺式的NMR可变温度研究如此获得的融合多环醇表明,它们在溶液中固有的构象柔韧性在室温下受到限制,这是由于形成了稳定的氢键分子溶剂化物或存在强大的分子内O–H⋯O H键。对三种己醇的单晶X射线衍射研究表明,它们的总分子堆积和R 2 2(10)二聚体基序无处不在,这是在构象锁定和轴向结构的晶体结构中很少遇到的超分子合成子。丰富的己醇。