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
An enantioselective preparation of both enantiomers of alkaloid 241D 1 and its C-4 epimer is reported. This simple and concise synthesis, seven steps from pent-3-en-2-one, involves a highly diastereoselective Mannich-type cyclisation as the key step.
Wacker-Type Oxidation of Internal Alkenes using Pd(Quinox) and TBHP
作者:Ryan J. DeLuca、Jennifer L. Edwards、Laura D. Steffens、Brian W. Michel、Xiaoxiao Qiao、Chunyin Zhu、Silas P. Cook、Matthew S. Sigman
DOI:10.1021/jo302638v
日期:2013.2.15
The Pd-catalyzed TBHP-mediated Wacker-type oxidation of internal alkenes is reported. The reaction uses 2(4,5-dihydro-2-oxazolyl)quinoline (Quinox) as ligand and TBHP(aq) as oxidant to deliver single ketone constitutional isomer products in a predictable fashion from electronically biased olefins. This methodology is showcased through its application on an advanced intermediate in the total synthesis of the antimalarial drug artemisinin.