Silphos [PCl 3− n (SiO 2) n]: a heterogeneous phosphine reagent for formylation and acetylation of alcohols and amines with ethyl formate and acetate
N Iranpoor, H Firouzabadi, A Jamalian
Index: Iranpoor, Nasser; Firouzabadi, Habib; Jamalian, Arezu Tetrahedron Letters, 2005 , vol. 46, # 46 p. 7963 - 7966
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Citation Number: 61
Abstract
The use of coupling reagents under Steglich or Mitsunobu conditions 15d, 16, 17 and 18 or nucleophilic phosphine catalysts such as tributylphosphine/excess Et 3 N 19 are other methods for esterification of sensitive molecules. However, tertiary phosphines suffer from poor air stability, toxicity, and flammability and separation of the products from the reaction mixture requires an acid wash which can be drawbacks of this approach. ... We have recently reported the preparation of ...
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