由N-苯基磺酰基吲哚通过锂化,用D 2 O淬灭并水解来制备2-氘代吲哚。用琥珀酸酐处理2-氘代吲哚格利雅试剂,得到4-(吲哚-3-基)-4-氧代丁酸,氘从2-位部分损失。以相同方式处理的2,3-二氘代吲哚(通过酸催化的2-氘代吲哚的氘代制备)得到吲哚基2-氧代丁酸,其在吲哚基2-位的氘代率为92%。还原为氘代吲哚基丁醇并用叔丁醇钾处理其甲苯对磺酸盐,得到2-氘代-螺[环戊烷-3'-(3 H)吲哚]在2位上氘化了88%。测量了氘代吲哚及其非氘代类似物的酸催化重排动力学,发现拟一级速率常数的比值k H / k D为1.08,表明同位素效应非常小。
Single Bifunctional Ruthenium Catalyst for One-Pot Cyclization and Hydration giving Functionalized Indoles and Benzofurans
作者:Reji N. Nair、Paul J. Lee、Arnold L. Rheingold、Douglas B. Grotjahn
DOI:10.1002/chem.201001075
日期:2010.7.19
Bifunctional is more than twice as fun! At low loading, catalyst 1 (see scheme) can form two important heterocycle classes, apparently by attack of XH on a vinylidene intermediate. Aza‐ and nitroindoles can be formed, and all N‐protecting groups tested (alkyl, allyl, sulfonyl) were tolerated. The newly formed ring can be deuterated in one step, and for substrates with two terminal alkynes, cyclization