After the historic $495 million sale of postwar and contemporary art at  Christie’s, there was considerable curiosity surrounding Phillips’s far  more modest one on Thursday evening.   Could the third contemporary art auction of the week do well,  considering that at Christie’s on Wednesday night, paintings by Jackson  Pollock, Roy Lichtenstein and Jean-Michel Basquiat smashed all previous  auction records?          Although the struggling boutique auction house managed to win pricier  materials than in recent seasons, it had only one real star — Warhol’s  “Four Marilyns.” The 1962 painting of Marilyn Monroe, times four, sold  for $34 million, or $38.2 million with fees. (Its estimated sale price  was $35 million to $45 million.) The buyer, Victoria Gelfand, a director  at the Gagosian Gallery, beat out three other bidders.    While officials at Phillips declined to discuss the story behind the  consignment, people familiar with the transaction say Phillips’s owners,  the Russian...