Design of Chiral Bis-phosphoric Acid Catalyst Derived from (R)-3,3鈥?Di(2-hydroxy-3-arylphenyl)binaphthol: Catalytic Enantioselective Diels鈥揂lder Reaction of 伪,尾-Unsaturated Aldehydes with Amido

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• 作者：Norie Momiyama ; Tohru Konno ; Yuichi Furiya ; Takeaki Iwamoto ; Masahiro Terada
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：December 7, 2011
• 年：2011
• 卷：133
• 期：48
• 页码：19294-19297
• 全文大小：798K
• 年卷期：v.133,no.48(December 7, 2011)
• ISSN：1520-5126

文摘

Chiral bis-phosphoric acid 1 was designed to identify a new class of structural features in chiral Br酶nsted acid catalysts. X-ray diffraction analysis revealed the single atropisomer 1, bearing S axial chirality at 3,3鈥?biaryl substituents on (R)-binaphthyl and intramolecular hydrogen bonding between the two phosphoric acid moieties. The newly designed bis-phosphoric acid 1 was evaluated in the Diels鈥揂lder reaction of 伪,尾-unsaturated aldehydes 4 with 1-N-acylamino-1,3-butadienes 3. After systematic variation of the catalyst substituents, as well as the N-acyl substituents of 1,3-butadiene, the use of an N-Cbz amidodiene 3a in the presence of bis-phosphoric acid 1e with a 2,4,6-tri-isopropylphenyl group was found to be optimal to yield the 1S,6R enantiomeric product 5aa in a Diels鈥揂lder reaction of acrolein (4a). Application of this method to substituted substrates was found to be an efficient approach to the enantioselective synthesis of 3- and 3,6-substituted cyclic formylcarbamates 5. The specific character as well as the utility of 1e was further established by comparing its enantioselectivity, absolute stereochemistry, and catalytic efficiency with those of mono-phosphoric acid 2.