Ruthenium-catalyzed cyclization of N-carbamoyl indolines with alkynes: an efficient route to pyrroloquinolinones
作者:Ramasamy Manoharan、Masilamani Jeganmohan
DOI:10.1039/c5ob01146a
日期:——
A regioselective synthesis of substituted pyrroloquinolinones via a ruthenium-catalyzed oxidative cyclization of substituted N-carbamoyl indolines with alkynes is described. The cyclization reaction was compatible with various symmetrical and unsymmetrical alkynes including substituted propiolates. Later, we performed the aromatization of pyrroloquinolinones into indole derivatives in the presence
Oxidative Palladium(II)-Catalyzed C-7 Alkenylation of Indolines
作者:Lin-Yu Jiao、Martin Oestreich
DOI:10.1021/ol402687t
日期:2013.10.18
A mild procedure for C-7-selective C–H alkenylation of various indolines under oxidative palladium(II) catalysis is reported. A fully substituted urea, formed by carbamoylation of the indoline nitrogen atom, functions as a directing group. Both α,β-unsaturated acceptors and styrenes participate in this direct C–H functionalization. With a free NH group at the urea terminus, the nitrogen atom subsequently
biologically essential pyrroloquinolinones has been developed under Cp*CoIII catalysis, which involves a cascade reaction of C(7)–H alkenylation with alkynes followed by nucleophilic addition. A wide variety of internal alkynes including enyne, diyne, and ynamide and more challenging terminalalkynes were successfully employed for the annulation in good to excellent yield with high regioselectivity.
Exceptionally Mild Palladium(II)-Catalyzed Dehydrogenative C–H/C–H Arylation of Indolines at the C-7 Position under Air
作者:Lin-Yu Jiao、Polina Smirnov、Martin Oestreich
DOI:10.1021/ol503035z
日期:2014.11.21
method for the dehydrogenative C–H/C–H cross-coupling at the C-7 position of indolines containing a urea as a directing group is reported. The new protocol is a rare example of an aerobic palladium(II)-catalyzed crossdehydrogenativecoupling (CDC) reaction that proceeds at low temperature. The use of either Cu(OAc)2 in an open flask or dioxygen (balloon) at 50 °C tolerates indolines not substituted