Organocatalytic Asymmetric Tandem Cyclization/Michael Addition via Oxazol-5(2H)-One Formation: Access to Perfluoroalkyl-Containing N,O-Acetal Derivatives

Total synthesis of antiviral drug, nirmatrelvir (PF-07321332)

The emergence and rapid spread of coronavirus disease 2019 (COVID-19), a potentially fatal disease, caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), has swiftly led to public health crisis worldwide. Hence vaccines and antiviral therapeutics are an important part of the healthcare response to combat the ongoing threat by COVID-19. Here, we report an efficient synthesis of nirmatrelvir (PF-07321332), an orally active SARS-CoV-2 main protease inhibitor.

Asymmetric Brønsted base-catalyzed aza-Michael addition and [3 + 2] cycloaddition reactions of N-ester acylhydrazones and enones

We reported the first enantioselective Brønsted base-catalyzed aza-Michael addition and stepwise cascade [3+2] cycloaddition between acylhydrazones and unsaturated ketones. The enantio-enriched aza-Michael adducts can be transformed into 2-pyrazolines.

Sythesis of γ-hydroxy-γ-perfluoroalkyl butenolides and exocyclic double bond butanolides via regioselective allylic alkylations of MBH carbonates with 2-perfluoroalkyl-oxazol-5(2H)-ones

Herein, two general one-pot two-step methods for the preparation of γ-hydroxyl-γ-perfluoromethyl butenolides and γ- hydroxyl-γ-perfluoromethyl exocyclic double bond butanolides from Morita−Baylis−Hillman (MBH) carbonates with 2-perfluoroalkyl-oxazol-5(2H)-ones have been reported for the...

Copper(i)-catalyzed asymmetric [3 + 2] cycloaddition of N-ester acylhydrazones and β-trifluoromethyl-α,β-unsaturated ketones

The first copper(i)-catalyzed asymmetric [3 + 2] cycloaddition of N-ester acylhydrazones and ketones has been developed, affording an array of chiral pyrazolidines containing a trifluoromethyl moiety bearing three vicinal stereocenters.

Enantioselective organocatalytic amination of 2-perfluoroalkyl-oxazol-5(2H)-ones towards the synthesis of chiral N,O-aminals with perfluoroalkyl and amino groups

The first highly enantioselective amination at the C-2 position of oxazol-5(2H)-ones has been presented. Two efficient relay asymmetric transformation processes were successfully utilized to synthesize chiral N,O-aminals with a quaternary center.

Asymmetric hydrogenation of trifluoromethyl ketones: application in the synthesis of Odanacatib and LX-1031

The asymmetric hydrogenation of trifluoromethyl ketones via iridium catalysis to access chiral secondary 2,2,2-trifluoroethanols is presented. The key intermediates of Odanacatib and LX1301 were prepared with high yields and enantioselectivities.