Rh(III)-Catalyzed Olefination of N-Sulfonyl Imines: Synthesis of Ortho-Olefinated Benzaldehydes
摘要:
Rh(III)-catalyzed olefination of N-sulfonyl imines using acrylates and styrenes has been achieved for the synthesis of ortho-olefinated benaldehydes. This reaction proceeds via a chelation assisted C-H olefination/in situ hydrolysis process.
A process for preparing lacidipine, comprising reacting a t-butoxy carbonyl methyl aryl phosphonium halide with o-phthalaldehyde, and further reacting a product comprising (E)-3-(2-formylphenyl)-2-propenoic acid, 1,1-dimethyl ethyl ester, without isolation, with ethyl-3-amino crotonate.
Halogen‐Bridged Methylnaphthyl Palladium Dimers as Versatile Catalyst Precursors in Coupling Reactions
作者:Nardana Sivendran、Nico Pirkl、Zhiyong Hu、Angelino Doppiu、Lukas J. Gooßen
DOI:10.1002/anie.202110450
日期:2021.11.15
Halide-bridged 1- and 2-methylnaphthyl palladium dimers are presented as convenient, yet highly efficient palladium sources for cross-coupling catalysis. The bench-stable complexes smoothly react with various ligands yielding monoligated palladium precatalysts. These display record-setting activity in various catalytic reactions, clearly beyond that achievable by ligand screening alone.
Copper Catalyzed One-Pot Three-Component Imination–Alkynylation–aza-Michael Sequence: Enantio- and Diastereoselective Syntheses of 1,3-Disubstituted Isoindolines and Tetrahydroisoquinolines
作者:Braja Gopal Das、Sadhna Shah、Vinod K. Singh
DOI:10.1021/acs.orglett.9b01507
日期:2019.7.5
An enantio- and diastereoselective syntheses of 1, 3-disubstituted isoindolines and tetrahydroisoquinolines via CuI-Pybox-diPh catalyzed one-pot imination–alkynylation–aza-Michael sequence has been reported. The three-component reaction produces one C–C and two C–N bonds sequentially with high yield (up to 92%), enantioselectivity (up to 99%), and diastereoselectivity (up to 9:1) in a single operation
已经报道了通过Cu I -Pybox-diPh催化的一锅式胺化-炔基化-氮杂-迈克尔序列对1,3-二取代的异吲哚啉和四氢异喹啉的对映体和非对映体选择性合成。三组分反应在一次操作中依次产生一个C–C和两个C–N键,且产率高(高达92%),对映选择性(高达99%)和非对映选择性(高达9:1)。此外,已经通过LiAlH 4的酯还原和炔烃官能度的氢化而不丧失立体选择性证明了该产品的合成效用。
作者:Xi Liu、Zhonghao Wang、Qun Chen、Ming‐yang He、Liang Wang
DOI:10.1002/aoc.4039
日期:2018.2
A Rhodium(III)‐catalyzed ortho‐C‐H olefination of aromatic aldehydes in the presence of catalytic amount of TsNH2 has been developed. The in situ generated imine intermediate from aldehyde and TsNH2 worked as a transient directing group. Both electron‐rich and electron‐deficient aromatic aldehydes were tolerated, affording the corresponding products in moderate to good yields. Importantly, the present
Compounds are described of the formula ##STR1## wherein R.sub.1 and R.sub.4 independently represent a C.sub.1-4 alkyl group; R.sub.2 and R.sub.3 independently represent a C.sub.1-6 straight or branched alkyl chain which may be interrupted by an oxygen atom; R.sub.5 represents a straight or branched chain C.sub.1-13 alkyl group or a C.sub.5-8 cycloalkyl group which may be substituted by a C.sub.1-3 alkyl substitutent; The compounds represented by formula (I) reduce intracellular calcium ion concentration by limiting transmembranal calcium ion influx and thus may be useful for the treatment of cardiovascular disorders such as hypertension.