Synthesis of (±)-coerulescine and a formal synthesis of (±)-horsfiline
摘要:
A straightforward synthesis of (+/-)-coerulescine and (+/-)-horsfiline has been established from 3-formyl-3-phenylpyrridine employing 4-hydroxypiperidine as the starting material. There are two remarkable steps for the synthesis of (+/-)-coerulescine and ()-horsfiline. One is the rapid access to produce 3-formyl-3-phenylpyrrolidine by Lewis acid-catalyzed rearrangement of 3,4-dihydroxy-4-phenylpiperidine. The other key step is an intramolecular electrophilic cyclization from 3-benzylcarbamoyl-3-plienylpyrrolidine to the 3,3-spirocyclic 2-oxindole ring skeleton. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of (±)-coerulescine and a formal synthesis of (±)-horsfiline
摘要:
A straightforward synthesis of (+/-)-coerulescine and (+/-)-horsfiline has been established from 3-formyl-3-phenylpyrridine employing 4-hydroxypiperidine as the starting material. There are two remarkable steps for the synthesis of (+/-)-coerulescine and ()-horsfiline. One is the rapid access to produce 3-formyl-3-phenylpyrrolidine by Lewis acid-catalyzed rearrangement of 3,4-dihydroxy-4-phenylpiperidine. The other key step is an intramolecular electrophilic cyclization from 3-benzylcarbamoyl-3-plienylpyrrolidine to the 3,3-spirocyclic 2-oxindole ring skeleton. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of (±)-coerulescine and a formal synthesis of (±)-horsfiline
作者:Meng-Yang Chang、Chun-Li Pai、Yung-Hua Kung
DOI:10.1016/j.tetlet.2005.10.015
日期:2005.12
A straightforward synthesis of (+/-)-coerulescine and (+/-)-horsfiline has been established from 3-formyl-3-phenylpyrridine employing 4-hydroxypiperidine as the starting material. There are two remarkable steps for the synthesis of (+/-)-coerulescine and ()-horsfiline. One is the rapid access to produce 3-formyl-3-phenylpyrrolidine by Lewis acid-catalyzed rearrangement of 3,4-dihydroxy-4-phenylpiperidine. The other key step is an intramolecular electrophilic cyclization from 3-benzylcarbamoyl-3-plienylpyrrolidine to the 3,3-spirocyclic 2-oxindole ring skeleton. (c) 2005 Elsevier Ltd. All rights reserved.