Aldehyde Selective Wacker Oxidations of Phthalimide Protected Allylic Amines: A New Catalytic Route to β<sup>3</sup>-Amino Acids
作者:Barbara Weiner、Alejandro Baeza、Thomas Jerphagnon、Ben L. Feringa
DOI:10.1021/ja902591g
日期:2009.7.15
A newmethod for the synthesis of beta(3)-amino acids is presented. Phthalimide protected allylic amines are oxidized under Wacker conditions selectively to aldehydes using PdCl(2) and CuCl or Pd(MeCN)(2)Cl(NO(2)) and CuCl(2) as complementary catalyst systems. The aldehydes are produced in excellent yields and exhibit a large substrate scope. Beta-amino acids and alcohols are synthesized by oxidation
pungent principle of hot pepper, and its 15 analogs have been efficiently synthesized. The key step of this synthetic sheme is the orthoester Claisen rearrangement, which transformed allylic alcohols 2A-C to (E)-alkenoates 3A-C () in a highly stereoselective manner. The subsequent carbon chain elongations on 3 based on the cyanation or the malonic acid estersynthesis afforded (E)-alkenoic acids 8, which
A simple procedure for the synthesis of three-carbon homologated boronate esters and terminal alkenes via nucleopbilic displacement in α-haloallylboronate ester
作者:Herbert C. Brown、Milind V. Rangaishenvi
DOI:10.1016/s0040-4039(00)97255-1
日期:1990.1
transfer reactions of α-haloallylboronate ester I with representative organolithium and Grignard reagents provide α-alkyl- or α-aryl-subsfituted aUylboronate esters, readily converted into three-carbonhomologated boronate esters and terminal alkenes.
A Rh(iii)-catalyzed and weak coordination carbonyl guided direct C4 alkylation of indoles with allylic alcohols was developed with excellent regioselectivity. This reaction was conducted under mild conditions, leading to a variety of β-indolyl ketones with good functional group tolerance in moderate to good yields.