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. Author manuscript; available in PMC: 2019 Mar 7.
Published in final edited form as: European J Org Chem. 2017 Dec 28;2018(9):1075–1096. doi: 10.1002/ejoc.201701579

Table 2.

Modulating effect of DMF on stereoselectivity.

graphic file with name nihms966139u5.jpg
Entry DMF (equiv.) Yield (%) of 214 α:β ratio
1a 0 90 1:1
2a 1.5 82 6:1
3b 1.5 80 8:1
4b 3.0 87 15:1
5b 6.0 87 19:1
a

Entries 1 and 2: Non-preactivation;

b

Entries 3, 4 and 5: Pre-activation.