Facile synthesis of 1-alkoxy-1<i>H</i>-benzo- and 7-azabenzotriazoles from peptide coupling agents, mechanistic studies, and synthetic applications
作者:Mahesh K Lakshman、Manish K Singh、Mukesh Kumar、Raghu Ram Chamala、Vijayender R Yedulla、Domenick Wagner、Evan Leung、Lijia Yang、Asha Matin、Sadia Ahmad
DOI:10.3762/bjoc.10.200
日期:——
utility, this novel reaction has been used to prepare a series of acyclic nucleoside-like compounds. Because BtO(-) is a nucleofuge, several Bt-OCH2Ar substrates have been evaluated in nucleophilic substitution reactions. Finally, the possible formation of Pd pi-allyl complexes by departure of BtO(-) has been queried. Thus, alpha-allylation of three cyclic ketones was evaluated with 1-(cinnamyloxy)-1H-benzo[d][1
(1H-苯并[d][1,2,3]三唑-1-基氧基)三(二甲氨基)鏻六氟磷酸盐(BOP),1H-苯并[d][1,2,3]三唑-1-基4-甲基苯磺酸盐 (Bt-OTs) 和 3H-[1,2,3]三唑并[4,5-b]吡啶-3-基 4-甲基苯磺酸盐 (At-OTs) 通常用于肽合成中形成酰胺键。然而,这些化合物与醇在碱存在下发生先前未描述的反应,产生1-烷氧基-1H-苯并-(Bt-OR)和7-氮杂苯并三唑(At-OR)。尽管 BOP 与醇反应生成 1-烷氧基-1H-苯并三唑,但 Bt-OT 被证明更优越。伯醇和仲醇都在通常温和的反应条件下进行反应。相应地,由At-OTs合成了1-烷氧基-1H-7-氮杂苯并三唑。从机理上讲,这些肽偶联剂可通过三种途径与醇发生反应。从(31)P(1)H}、[(18)O]-标记和其他化学实验来看,醇的鏻和甲苯磺酸衍生物似乎是中间体。然后它们与原位产生的 BtO(-) 和