Synthesis 2023; 55(24): 4163-4172
DOI: 10.1055/a-2152-0671
paper

Prins Cyclization: Novel Strategy towards the Diastereoselective Total Synthesis of (–)-Cryptocaryolone

Dhanraj O. Biradar
a   Indian Institute of Chemical Technology, Hyderabad 500007, Telangana, India
b   Maharashtra Mahavidyalaya, Nilanga 413521, Dist. Latur, M.S., India
,
c   BSS Arts, Science & Commerce College, Makni, Tq. Lohara 413604, Dist. Osmanabad, M.S., India
,
Jhillu Singh Yadav
a   Indian Institute of Chemical Technology, Hyderabad 500007, Telangana, India
,
Basi V. Subba Reddy
a   Indian Institute of Chemical Technology, Hyderabad 500007, Telangana, India
› Institutsangaben
Financial support was provided by the Council of Scientific and Industrial Research (CSIR), New Delhi.


Abstract

A highly diastereoselective total synthesis of TBDPS-protected (–)-cryptocaryolone has been achieved in 12 linear steps with an overall yield of 7.1%, following a recently developed Prins cyclization strategy for the construction of trans-2,6-disubstituted 3,4-dihydropyrans. Another key intermediate, i.e. syn-1,3-diol, was prepared by the Wacker oxidation followed by a hydroxyl-directed syn-reduction of the keto functionality. In this report, the versatility of Prins cyclization in the total synthesis of TBDPS-protected (–)-cryptocaryolone is demonstrated. The key steps involved in the approach are Prins cyclization for the construction of the trans-2,6-disubstituted dihydropyran, Wacker oxidation and a hydroxyl-directed syn-reduction reaction.

Supporting Information



Publikationsverlauf

Eingereicht: 12. Mai 2023

Angenommen: 10. August 2023

Accepted Manuscript online:
10. August 2023

Artikel online veröffentlicht:
16. Oktober 2023

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