The Catalytic Enantioselective, Protecting Group-Free Total Synthesis of (+)-Dichroanone
摘要:
Herein we report the first enantioselective total synthesis of (+)-dichroanone, confirming the absolute configuration of the natural product. This protecting group-free route features the first application of our enantioselective Tsuji allylation in the context of a natural product total synthesis. Additionally, this 11-step preparation of the molecule from commercial material features a novel Kumada-aromatization strategy and a rapid sequence for the conversion of a phenol to a hydroxy-p-benzoquinone.
作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
Enantioselective, catalytic allylation of ketones and olefins
申请人:Behenna C. Douglas
公开号:US20060084820A1
公开(公告)日:2006-04-20
Compounds containing a substituted or unsubstituted allyl group directly bound to a chiral carbon atom are prepared enantioselectively. Starting reactants are either chiral or achiral, and may or may not contain an attached allyloxycarbonyl group as a substituent. Chiral ligands are employed, along with transition metal catalysts. The methods of the invention are effective in providing enantioconvergent allylation of chiral molecules.
The Catalytic Enantioselective Total Synthesis of (+)-Liphagal
作者:Joshua J. Day、Ryan M. McFadden、Scott C. Virgil、Helene Kolding、Jennifer L. Alleva、Brian M. Stoltz
DOI:10.1002/anie.201101842
日期:2011.7.18
Ring a ding: The meroterpenoid natural product (+)‐liphagal has been synthesized enantioselectively in 19 steps from commercially available materials. The trans‐homodecalin system was achieved by ring expansion followed by stereoselective hydrogenation.
Ring a ding : 类萜天然产物 (+)-lipphagal 已经从市售材料中通过 19 步对映选择性合成。的反式-homodecalin系统是由环扩大,随后通过立体选择性氢化来实现。
The Enantioselective Tsuji Allylation
作者:Douglas C. Behenna、Brian M. Stoltz
DOI:10.1021/ja044812x
日期:2004.11.1
The first catalytic enantioselective examples of the Tsuji allylation using enol carbonates and enol silanes are described. The products possess a quaternary stereogenic center and are useful building blocks for synthetic chemistry.
Deracemization of Quaternary Stereocenters by Pd-Catalyzed Enantioconvergent Decarboxylative Allylation of Racemic β-Ketoesters
作者:Justin T. Mohr、Douglas C. Behenna、Andrew M. Harned、Brian M. Stoltz