Microwave-assisted combined Mitsunobu reaction–Claisen rearrangement and microwave-assisted phenol oxidation: rapid synthesis of 2,6-disubstituted-1,4-benzoquinone natural products
作者:Aouregan M. Jacob、Christopher J. Moody
DOI:10.1016/j.tetlet.2005.10.096
日期:2005.12
Microwave irradiation of a phenol, an allylic alcohol, di-isopropyl azodicarboxylate and triphenylphosphine at 220-240 degrees C for 30 min results in a combined Mitsunobu reaction and Claisen rearrangement to give the rearranged 2-allylphenol. Following the first detailed study of microwave-assisted phenol oxidation, rapid syntheses of the natural products primin and 2-methoxy-6-pentadecyl-1,4-benzoquinone (four reaction steps, total reaction time I h) were achieved using this combined Mitsunobu-Claisen strategy in combination with two further microwave-assisted steps (alkene hydrogenation and phenol oxidation). (c) 2005 Elsevier Ltd. All rights reserved.