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Guest Post, Still In The RBF »

[6 Aug 2011 | 17 Comments | 15,425 views]
Omphadiol

Romo, Liu. ACIEE, 2011, 50, 7537-7540. DOI: 10.1002/anie.201102289
Guest Blogger: SPF
What if I’d ask you to synthesize this little molecule with six neighbouring stereocenters from biologically available material? Oh, by the way you can’t use any protecting groups and keep it short! Sounds impossible? Not according to Romo et al.. They’ve achieved the synthesis of this stereo-dense molecule in 10 steps from (R)-carvone (Mmmhhh spearmint). (+)-Omphadiol belongs to the africanane (guess where they grow) family of sesquiterpenes. Its brothers and sisters show some significant bioactivity, but due to insufficient …

Guest Post, Still In The RBF »

[29 Jul 2011 | 10 Comments | 14,782 views]
Trigonoliimines A-C

Guest Blogger: See-Arr-Oh
Han and Movassaghi, JACS 2011, 10768-10771. DOI: 10.1021/ja204597k ; Qi, Bao, and Tambar, JACS 2011, 10050-10053. DOI: 10.1021/ja203960b .
It’s not too often JACS publishes total syntheses anymore, since their role as a general chemistry journal means every newly built molecule competes against quantum dots, in silico simulations,  or new battery materials. So you can imagine my utter shock and delight at finding not one, but two almost back-to-back syntheses in the past month!  First, the Porco / Ready combination of Kibdelone C, followed closely by two syntheses …

Guest Post, Still In The RBF »

[16 Jun 2011 | 29 Comments | 19,205 views]
Cyanolide A Aglycon

Rychnovsky, Gesinski. JACS, 2011, ASAP. DOI: 10.1021/ja204228q
Guest Blogger: See-Arr-Oh
When I first saw the dimeric gamma-substituted pyran motif in this molecule, I said “Gotta be Rychnovsky” (or maybe Wender).   Throughout his career at UC-Irvine, Scott Rychnovsky has been the master of the TMS-promoted diastereoselective Prins cyclization, which he has applied to the synthesis of at least 10 macrolides.  Until now, however, none have been attempted sans protecting groups!
Cyanolide A was isolated in 2010, and it’s already been the target of four total syntheses.  Perhaps this is due to …