Conversion of<i>Meso</i>to<i>dl</i>Form and Vice Versa in Bisphosphonates: Synthesis and Structures of New<i>Meso</i>,<i>dl</i>and (<i>Meso + dl</i>) Bisphosphonates Derived from Cyclic Phosphites and Dialkyl Acetylenedicarboxylates
作者:K. C. Kumara Swamy、E. Balaraman
DOI:10.1055/s-2004-834906
日期:——
The bisphosphonates [(OCH 2 CR 2 -CH 2 O)P(O)CHC(O)OR'] 2 [R = R' = Me (5), R = Me, R' = Et (6), R = Et, R' = Me (7), R = R' = Et (8)], [CH 2 (6-t-Bu-4-Me-C 6 H 4 O) 2 P(O)CHC(O)OR] 2 [R = Me (9), Et (10)] and [(OCH 2 CMe 2 -CH 2 O)P(S)CHC(O)OR] 2 [R = Me (11), Et (12)] have been prepared by the reaction of the corresponding cyclic phosphites with dimethyl acetylenedicarboxylate or diethyl acetylenedicarboxylate
双膦酸盐[(OCH 2 CR 2 -CH 2 O)P(O)CHC(O)OR'] 2 [R = R' = Me (5), R = Me, R' = Et (6), R = Et, R' = Me (7), R = R' = Et (8)], [CH 2 (6-t-Bu-4-Me-C 6 H 4 O) 2 P(O)CHC(O) OR] 2 [R = Me (9), Et (10)] 和 [(OCH 2 CMe 2 -CH 2 O)P(S)CHC(O)OR] 2 [R = Me (11), Et (12) )]已经通过相应的环状亚磷酸酯与乙炔二羧酸二甲酯或乙炔二甲酸二乙酯在碱[Et 3 N或n-BuLi]存在下反应制备。6的dl-、meso和(dl + meso)形式[6a、6b和6ab]以及8的meso形式的结构由X射线晶体学确定。通过组合 X 射线结构和 3 1 P NMR 光谱研究,表明介观形式可以转化为