B. Chenera et al., TOTAL SYNTHESIS OF (PLUS-OR-MINUS)-CALANOLIDE-A, A NONNUCLEOSIDE INHIBITOR OF HIV-1 REVERSE-TRANSCRIPTASE, Journal of organic chemistry, 58(21), 1993, pp. 5605-5606
The first syntheses of (+/-)-calanolide A and the related (+/-)-calano
lides C and D have been carried out in a short sequence using a Lewis
acid-promoted Claisen rearrangement to establish the chromene ring.