The synthesis and reactivity of new 2-(N,N-diisopropylamino)-3-methylsulfonyl-1,3,2-benzoxazaphospholes. The utility of the 5-chloro analogue in the one-pot synthesis of oligothiophosphates: [ApsppA, ApspppA, ppp5′A2′ps5′A, m7GpsppA, Apspppp, Apspp]
作者:Nitin Puri、Sabine Hünsch、Christian Sund、Ivar Ugi、Jyoti Chattopadhyaya
DOI:10.1016/0040-4020(95)00031-3
日期:1995.3
mechanism for the synthesis of 43, 45 and 47 proceeds via the corresponding (dinucleoside 5′)-cyclometatriphosphite intermediates 50, 54, 52 and the (dinucleoside 5′)-1-thiocyclotriphosphate intermediates 51, 55, 53. The existence of these cyclic P(III) and P(V) intermediates were supported by31P- and1H-NMR spectroscopy. We here also demonstrate that 5-chlorobenzoxazaphosphole 23 can be used to synthesise
据报道2-(N,N-二异丙氨基氨基)-2,3-二氢-3-甲基磺酰基-1,3,2-苯并氮杂磷酰基22、23和24的合成。已经在亚磷酰胺化学中通常用于寡核苷酸合成的通常条件下,使用多种酸催化剂研究了它们的反应性。通过盐酸N-甲基苯甲酸铵(MAC)对其质子化物种25A,26A和27A进行酸催化,将22、23和24的活化速率(k)估计为6.813×10 -7(方案2)摩尔-1分钟-1,1.237×10 -6摩尔-1分钟-1和1.972×10 -7摩尔-1分钟-1在18℃下与作为0.56率的比率:1:0.16。通过MAC选择性活化的5-氯苯并恶唑磷23生成中间体2-(N-甲基苯胺基)-5-氯苯并恶唑磷26A(通过NMR测得〜90%),然后与醇(核苷)反应生成反应性2-烷氧基苯并氮杂唑30(方案4)或33-35(方案5)(〜70%,通过NMR)。然后,我们表明33–35(方案5)与双亲试剂,ADP,ATP或焦磷酸盐反应,生成相应的P