Generation and in situ Diels–Alder reactions of activated nitroethylene derivatives
作者:Peter A. Wade、James K. Murray、Sharmila Shah-Patel、Patrick J. Carroll
DOI:10.1016/s0040-4039(02)00348-9
日期:2002.4
Dienes readily undergo Diels–Alderreaction with CH2C(NO2)SO2Ph (2a), CH2C(NO2)CO2Et (2b), and CH2C(NO2)COPh (2c), all observed in situ by 1H NMR. The cycloadducts of 2a undergo SRN1 reactions.
Efficient Preparation of 2-Indolyl-1-nitroalkane Derivatives Employing Nitroalkenes as Versatile Michael Acceptors: New Practical Linear Approach to Alkyl 9<i>H</i>-β-Carboline-4-carboxylate
The combination of cerium(III) chloride heptahydrate and sodium iodide supported on silica gel is known to promote Michael-type additions. Continuing our work on solvent-free conditions, the CeCl3·7H2O−NaI−SiO2 system catalyzes the addition of a variety of indoles and nitroalkenes, giving 2-indolyl-1-nitroalkane derivatives in good yields. Development of this method has resulted in a new protocol for