922523-34-0

Upstream product

• 136320-65-5 1-((S)-3-iodo-2-methylpropoxymethyl)-4-methoxybenzene 
• 192060-67-6 (1R,2R)-(-)-pseudoephedrinepropionamide 
• 89238-99-3 O-(4-methoxybenzyl)-trichloroacetimidate 
• 132969-71-2 methyl (2S)-[(4-methoxybenzyl)oxy]-2-methylpropanoate 
• 136320-64-4 (2R)-3-[(4-methoxybenzyl)oxy]-2-methylpropanol 

Downstream Products

• 922523-35-1 C₁₆H₂₄O₃ 
• 169105-67-3 (2R,4S)-5-(benzyloxy)-2,4-dimethylpentan-1-ol 
• 1309460-62-5 methyl (2Z,4E,6R,7S,9S,10Z,12R,13S,14S,16S,19R,20R,21S,22S,23Z)-7,9,13,19-tetrakis(tert-butyldimethylsilyloxy)-21-(4-methoxybenzyloxy)-6,12,14,16,20,22-hexamethylhexacosa-2,4,10,23,25-pentaenoate 
• 1309460-58-9 (5S,6S,8S,11R)-5-[(R,Z)-4-iodobut-3-en-2-yl]-11-[(2R,3S,4S,Z)-3-(4-methoxybenzyloxy)-4-methylocta-5,7-dien-2-yl]-2,2,3,3,6,8,13,13,14,14-decamethyl-4,12-dioxa-3,13-disilapentadecane 
• 1309460-57-8 (2R,3R,4R,5R,8S,10S,11S,12R,Z)-5,11-bis(tert-butyldimethylsilyloxy)-14-iodo-3-(4-methoxybenzyloxy)-2,4,8,10,12-pentamethyltetradec-13-en-1-al 
• 1309460-56-7 (2S,3S,4R,5R,8S,10S,11S,12R,Z)-5,11-bis(tert-butyldimethylsilyloxy)-14-iodo-3-(4-methoxybenzyloxy)-2,4,8,10,12-pentamethyltetradec-13-en-1-ol 
• 1309460-55-6 (5S,6S,8S,11R,12R,13S,14S)-11-(tert-butyldimethylsilyloxy)-5-[(R,Z)-4-iodobut-3-en-2-yl]-13-[(4-methoxybenzyl)oxy]-2,2,3,3,6,8,12,14,17,17,18,18-dodecamethyl-4,16-dioxa-3,17-disilanonadecane 
• 1309460-54-5 (5S,6S,8S,11R,12R,13S,14S)-11-(tert-butyldimethylsilyloxy)-5-[(R)-4-iodobut-3-yn-2-yl]-13-[(4-methoxybenzyl)oxy]-2,2,3,3,6,8,12,14,17,17,18,18-dodecamethyl-4,16-dioxa-3,17-disilanonadecane 
• 1309460-53-4 (5S,6S,8S,11R,12R,13S,14S)-5-[(R)-but-3-yn-2-yl]-11-[(tert-butyldimethylsilanyl)oxy]-13-[(4-methoxybenzyl)oxy]-2,2,3,3,6,8,12,14,17,17,18,18-dodecamethyl-4,16-dioxa-3,17-disilanonadecane 
• 1257329-16-0 (2R,6R,8S)-9-(benzyloxy)-2-[(4S,5S)-2-(4-methoxyphenyl)-5-methyl-1,3-dioxan-4-yl]-6,8-dimethylnon-4-yn-3-one 
• 1257329-51-3 C₆₃H₁₁₁Cl₃O₈Si₄ 
• 1257329-46-6 (2Z,4E,6R,7S,9R,10Z,12S,13R,14S,16S,19R,20R,21S,22S,23Z)-methyl 7,9,13,19-tetrakis(tert-butyldimethylsilyloxy)-21-(4-methoxybenzyloxy)-6,12,14,16,20,22-hexamethylhexacosa-2,4,10,23,25-pentaenoate 
• 1257329-38-6 (2R,3R,4R,5R,8S,10S,11R,12S,Z)-5,11-bis(tert-butyldimethylsilyloxy)-14-iodo-3-(4-methoxybenzyloxy)-2,4,8,10,12-pentamethyltetradec-13-en-1-al 
• 1257329-36-4 (2S,3S,4R,5R,8S,10S,11R,12S,Z)-5,11-bis(tert-butyldimethylsilyloxy)-14-iodo-3-(4-methoxybenzyloxy)-2,4,8,10,12-pentamethyltetradec-13-en-1-ol 

Relevant academic research and scientific papers

Highly stereoselective total synthesis of (+)-9-epi-Dictyostatin and (-)-12,13-Bis-epi-dictyostatin

The total syntheses of (+)-9-epi-dictyostatin (1a) and (-)-12,13-bis-epi- dictyostatin (1b), diastereomers of the antimitotic marine sponge-derived macrolide (-)-dictyostatin (1), were achieved by creating 11 stereogenic centers and 4stereogenic double bonds with a high level of stereocontrol. The yield for the 29-step longest linear sequence from Roche ester was 1.53 and 1.52%, respectively. The final key steps to these unnatural products were the addition of vinylzincates C10-C26 to aldehyde C1-C9 (leading surprisingly to complete stereoselectivity for the 9R-configuration in 28a and for the 9S-configuration in 12,13-bis-epimeric 28b), followed by Yamaguchi macrolactonization and global deprotection. (-)-12,13-Bis-epi-dictyostatin (1b) displayed a dramatic decrease of cytotoxicity and of the affinity toward the paclitaxel binding site of microtubules. Eleven stereogenic centers and fourstereogenic double bonds were obtained with a high level of stereocontrol in the total synthesis of (+)-9-epi-dictyostatin and(-)-12,13-bis-epi-dictyostatin, diastereomers of the antimitotic marine sponge-derived macrolide (-)-dictyostatin.

A highly stereoselective synthesis of the C10-C23 fragment of (-)-dictyostatin

A highly stereoselective synthesis of the C10-C23 fragment of (-)-dictyostatin has been achieved using a Carreira alkynylation and a Marshall-Tamaru allenylzinc addition as key steps. The Royal Society of Chemistry.

Synthesis of the southern FGHI ring system of azaspiracid-1 and investigation into the controlling elements of C28- and C36-ketalization

Heading south: An efficient approach to the FGHI southern ring system of azaspiracid-1 is disclosed. Each of the eight stereogenic centers is generated with excellent diastereoselectivity. In addition, the stereochemical outcome of the ketalization steps could be controlled by careful selection of the conditions. Teoc = 2-(trimethylsilyl)ethoxycarbonyl; TMS = trimethylsilyl; TIPS = triisopropylsilyl; Bn = benzyl. (Chemical Equation Presented).